Condition the body for longer rounds by developing strength, endurance, and efficient movement under fatigue. This module increases round duration and punch volume, training the arms, shoulders, core, and legs to maintain relaxed technique and consistent output as sessions become more demanding.
Explainer Video
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Description
This lesson develops fluid evasive movement, coordinated footwork, and relaxed power generation under continuous rhythm. By combining steady combinations with constant bobbing, weaving, and stance changes, you’ll train your body to stay mobile, unpredictable, and structurally balanced while striking. The focus is on generating power through relaxed rotation and efficient body movement rather than muscular tension, helping build endurance, coordination, timing, and defensive awareness under fatigue. This is a critical stage in fighter development, teaching you to strike while constantly moving and repositioning rather than remaining fixed in front of the target.
Instructions
Maintain constant movement throughout the round, continuously bobbing, weaving, and shifting your weight using your legs rather than just moving your head. Build a steady rhythm of jabs, jab-crosses, and jab-cross-uppercut combinations in normal time while staying relaxed and flowing with the movement of the cobra bag. After each strike, avoid the returning path of the target on its second pass by slipping, weaving, or repositioning with your legs and body movement. Focus on generating power through the rotation and momentum of the body rather than muscular tension, returning each hand directly back to guard with the elbows naturally tucked in. Stay light on the balls of your feet with both feet generally pointing towards the target, and change stance whenever it feels natural to help develop coordination, balance, and equal strength on both sides of the body.
Coach Settings
Rounds: 3 | Round time: 2 min | Rest: 30 sec | Level: Beginner | Mic sensitivity: 7
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Explainer Video
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Description
This lesson develops efficient, accurate striking by keeping every punch on the same straight path while changing only the wrist orientation at contact. That constraint sharpens alignment through the front two knuckles while building strong, resilient forearms and improving wrist stability as rotation alternates under load. This is critical for fighters, as stronger forearms and better alignment help protect the hands and condition the knuckles for repeated impact. As fatigue builds, the goal is to maintain compact, controlled mechanics without wasted movement, training the shoulders, core, and forearms to sustain clean technique under pressure. This forms an essential foundation in fighter development, reinforcing precision, durability, and repeatable mechanics that hold up in real exchanges.
Instructions
Perform a continuous 4-punch sequence—jab, cross, uppercut, uppercut—keeping every strike on the same straight path from your guard to the target. Each punch starts from the same position and returns quickly to guard before the next strike. The hands travel along a very narrow line, passing close to each other, even brushing gloves at times, as if punching through an imaginary hole. The only change is in the finish: the jab and cross rotate to a standard palm-down position, while the uppercuts rotate to a palm-up position at the moment of contact. Keep your elbows tucked in close to your body and aim to strike with the front two knuckles almost like aiming down a barrel of a shotgun. Maintain a compact, controlled rhythm in regular time (or double-time once you feel confident), focusing on keeping the cobra bag moving back and forth in a linear trajectory.
Coach Settings
Rounds: 4 | Round time: 2 min | Rest: 30 sec | Level: Intermediate | Mic sensitivity: 5
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Explainer Video
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Description
Build speed, stamina, and precision in the jab — the most important tool in a boxer’s arsenal. In a real fight, the jab controls distance, disrupts rhythm, keeps an opponent guessing, and sets up stronger attacks while also serving as a key defensive tool. In training with the cobra bag it helps to establish and control the linear movement of the target. This lesson develops the endurance needed to throw repeated jabs efficiently, helping you maintain control and composure even as fatigue builds.
Instructions
Perform four or more rounds of just jabs, maintaining a steady rhythm and occasionally throwing in a double jab. Use the Beginner level in settings due to the relatively lower frequency of punches. Focus on keeping the elbows close to your body, sending the jab straight out and straight back without dropping the hand or exposing the body. Rotate the hand as it goes out and strike the target squarely with the first two knuckles, palm fist facing down. Keep your hands and shoulders relaxed at all times until the point of impact. Stay light on the balls of your feet with both feet angled towards the target, taking small adjustment steps to stay within the right range. Try randomising your strikes rather than keeping the same rhythm, including throwing faints. Switch stance if your leading shoulder starts to fatigue, or at the start of each round so both arms develop equally. Using weighted gloves such as Pounders is ideal but optional.
Coach Settings
Rounds: 4 | Round time: 1 min | Rest: 30 sec | Level: Beginner | Mic sensitivity: 7
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Explainer Video
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Description
Develop punching endurance so you can train harder and for longer without excessive fatigue or risk of injury.
Instructions
Use weighted gloves and longer rounds, such as 4 minutes each, to encourage your body to move more efficiently as it tires. Keep your elbows tucked in, relax your shoulders, and focus on throwing each punch with your whole body rather than relying on your arms alone.
Coach Settings
Rounds: 3 | Round time: 4 min | Rest: 30 sec | Level: Intermediate | Mic sensitivity: 8
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Explainer Video
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Description
Build core strength and seriously test your cardio with this double-time uppercut drill.
Instructions
Lower your cobra bag so the target sits roughly at chest level. Relax your shoulders and use your legs, core, and body rotation to deliver continuous uppercuts in a smooth, fluid rhythm. Try longer rounds, or use Infinity mode with Double Time enabled, so that as fatigue builds your body naturally learns to rely less on the shoulders and more on efficient whole-body movement.
Coach Settings
Rounds: 3 | Round time: 4 min | Rest: 30 sec | Level: Advanced | Mic sensitivity: 9
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Build the technical foundation required for efficient boxing on a cobra bag, focusing on stance, rhythm, breathing, rotation, and basic striking combinations. These fundamentals develop control, coordination, and relaxed movement, creating the base needed for speed, endurance, and more advanced combinations in later modules.
Explainer Video
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Description
Learn to work with the rhythm of the cobra bag. This lesson develops timing, touch, and the ability to stay relaxed on a moving target.
Instructions
Stand square to the bag and begin with light single taps using either glove. Do not strike hard. Allow the bag to rebound back and forth and back, and then tap it on the second return. Thus you're not tapping it every time it comes towards you, but every second time. Keep the shoulders relaxed and the hands loose until the moment of contact. Focus on breathing out on every tap and maintaining a steady rhythm that matches the speed of the bag. If the rhythm breaks and you find it hard to pick it up, stop the bag and begin from a static state.
Coach Settings
Rounds: 3 | Round time: 1 min | Rest: 30 sec | Level: Beginner | Mic sensitivity: 5
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Explainer Video
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Description
Learn how to move from a square stance into a proper fighter stance and understand its advantages. The fighter stance improves reach by placing the lead hand closer to the target and allows greater rotation from the hips and shoulders, helping generate stronger and more efficient crosses.
Instructions
Begin in a square stance and shift one foot slightly back to form a staggered fighter stance with the lead shoulder pointing toward the bag. If you're right-handed, your left foot should lead (orthodox stance). If you're left-handed, your right foot should lead (southpaw stance).
Keep your weight balanced between both feet and stay light on the balls of your feet. Both feet should remain angled toward the target. Begin delivering a relaxed 1-2-1-2 sequence from this stance, allowing the rear heel to rotate naturally during the cross. Keep your chin tucked, hands high, and elbows close to the body.
Focus on how the fighter stance increases reach and allows smoother rotation of the hips and shoulders. Stay relaxed throughout the round, letting the body rotation drive the punches rather than forcing power with the arms. This rotation builds momentum and improves efficiency while maintaining rhythm and control.
Coach Settings
Rounds: 3 | Round time: 1 min | Rest: 30 sec | Level: Beginner | Mic sensitivity: 5
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Explainer Video
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Description
Shadow boxing using hand weights to feel how punching starts from the whole body, not just the arms.
Instructions
Stand in a square stance on the balls of your feet, roughly shoulder-width apart and angled toward an imaginary target. Hold the weights near your chin with relaxed fists, palms facing inward and elbows close to your body. Push each hand forward like driving a heavy stone with your legs and whole body. As the punch extends, rotate the hand so the palm faces down at the point of imaginary impact. Tighten your grip only at the end, then snap the hand straight back along the shortest path. Breathe out through your teeth on every punch.
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Explainer Video
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Description
Learn to strike comfortably from both stances and to maintain the 1-2-1-2 rhythm. This helps develop balance, coordination, and adaptability. It might also help you to discover which stance feels most natural regardless of handedness.
Instructions
If you're right-handed, begin in a standard orthodox stance (left hand leading). If you're left-handed, begin in a southpaw stance (right hand leading). Perform a continuous jab-cross-jab-cross sequence for one full round while staying relaxed and breathing smoothly.
At the start of each new round, switch your stance so the opposite foot leads. Round 1 and Round 3 should use your original stance, while Round 2 and Round 4 use the opposite stance.
In both stances, keep your feet angled toward the target and stay light on the balls of your feet. Focus on rotating the back foot every time you throw the cross, keeping punches straight and controlled. After completing all four rounds, notice which stance feels more natural and balanced. That stance will likely become your dominant fighter stance, but learning to work comfortably from both has major long-term advantages.
Coach Settings
Rounds: 4 | Round time: 1 min | Rest: 30 sec | Level: Beginner | Mic sensitivity: 5
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Explainer Video
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Description
Learn to throw uppercuts and add them to your straight punch combinations, adding variety and working extra muscle groups.
Instructions
Start throwing a jab followed by an uppercut to get used to the positioning of the hand palm up and elbow tucked in at the point of impact with the target. Once you get the hang of that, try it in switch stance to get the feel for the other hand. Then try throwing continuous uppercuts and eventually add them to your straight punch combos, throwing [jab, cross, uppercut, uppercut] continuously.
Coach Settings
Rounds: 4 | Round time: 3 min | Rest: 30 sec | Level: Beginner | Mic sensitivity: 8
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Develop the ability to execute fast, precise combinations under increasing speed and pressure, similar to the tempo seen in high-level boxing. This module introduces double-time punching, advanced rhythm control, and faster cobra bag setups, training you to maintain accuracy, timing, and fluid movement during realistic, high-tempo exchanges.
Explainer Video
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Description
Put your training to the test in a sustained performance session designed to measure your ability to maintain speed, timing, and control under fatigue. In real boxing, effectiveness depends not only on technique but on the ability to repeat that technique consistently over multiple rounds. This test challenges you to maintain rhythm and composure while delivering fast combinations at performance tempo. The goal is consistency across rounds, maintaining form and efficiency as fatigue builds.
Instructions
Set the cobra bag to a fast performance setup similar to the one used throughout this module. Work through six rounds using your established combinations and movement patterns, focusing on steady breathing, clean rotation, and controlled rhythm. Avoid rushing or forcing punches as fatigue increases, maintaining consistent timing and technique throughout all rounds. Record your pace score at the end of the session and return to repeat the test, aiming to improve consistency or extend the session by adding additional rounds while maintaining the same fast performance pace.
Coach Settings
Rounds: 6 | Round time: 2 min | Rest: 30 | Level: Advanced | Mic sensitivity: 8
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Explainer Video
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Description
Introduce hooks into combinations while learning to control the cobra bag movement they create. Unlike straight punches, hooks introduce sideways or circular motion that disrupts the target’s natural back-and-forth rhythm, often causing unpredictable movement. This lesson develops the coordination and control needed to recover stability after hooking, using well-timed follow-up jabs to realign the target and restore consistent flow.
Instructions
Begin each sequence with controlled straight punches to establish rhythm, performing jab–cross followed by slip–uppercut–slip–uppercut with smooth timing. Introduce a hook while keeping the elbow lifted at roughly shoulder height so the punch travels along a clean circular path. After the hook, duck under the returning target and deliver a hook from the opposite side to redirect its movement. Use several well-placed jabs after the hooks to regain control and re-establish consistent back-and-forth movement before repeating the sequence. Focus on accuracy and control rather than speed, allowing the hands and eyes to work together to manage changing movement patterns.
Coach Settings
Rounds: 4 | Round time: 2 min | Rest: 30 | Level: Advanced | Mic sensitivity: 5
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Explainer Video
Coming Soon
Description
Develop the coordination and timing required to deliver accurate alternating hooks while maintaining continuous defensive movement. In real boxing exchanges, hooks must travel along clean circular paths while the body remains mobile and responsive. This drill trains precise hook angles and controlled ducking, building the leg strength, rhythm, and coordination needed to sustain movement under pressure. Even experienced fighters find this drill challenging, making it an excellent test of control and timing.
Instructions
Perform alternating hooks with each arm while maintaining the correct hook angle, keeping the elbow lifted at approximately shoulder height so the punch travels along a clean circular path. After each hook, duck under the returning target as it passes overhead, then rise smoothly to deliver the opposite-side hook, sending the target back along the same circular trajectory. Focus on accuracy and rhythm rather than power, maintaining relaxed shoulders and steady breathing while allowing the legs to absorb the work of continuous ducking.
Coach Settings
Rounds: 3 | Round time: 1 min | Rest: 30 sec | Level: Intermediate | Mic sensitivity: 5
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Explainer Video
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Description
Develop the timing required to deliver a fast 1–2, where the cross begins as the jab returns and both punches flow naturally without hesitation. In real boxing, proper timing of the 1–2 allows one strike to follow the next before an opponent can react, making it one of the most reliable offensive tools in the sport. This lesson builds the rhythm, coordination, and confidence needed to link clean punching with defensive movement, forming the foundation for faster, more advanced combinations.
Instructions
Set the cobra bag to a cadence that supports a fast 1–2 where the cross is delivered as the jab rebounds. Begin each round by establishing a clean linear rebound cadence with steady jabs, then introduce the fast 1–2 followed by a slip and back to jabs. Focus on relaxed shoulders, efficient rotation, and smooth transitions between punches and defensive movement. Switch stance after each round to develop timing and coordination on both sides.
Coach Settings
Rounds: 4 | Round time: 1 min | Rest: 30 sec | Level: Advanced | Mic sensitivity: 8
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
Explainer Video
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Description
Develop the ability to execute fast, relaxed combinations using whole-body rhythm, efficient rotation, and flowing movement. This lesson focuses on conserving energy while maintaining speed, timing, and accuracy during extended high-tempo exchanges.
Instructions
The aim of this lesson is to master the relaxed whole-body punching technique that can make training on the cobra bag feel almost like jogging or skipping rope, while developing long-term muscle memory for efficient movement and striking. Start relaxed. Focus on getting the legs and body/arm rotations to throw the punches, not the muscles in your shoulders. This is all about conserving energy and going for longer, almost like going for a long run.
Coach Settings
Rounds: 4 | Round time: 2 min | Rest: 30 | Pace: Medium | Mic sensitivity: 8
Session Results
Head over to Coach, run this lesson using the prescribed Coach settings, then return here and update your session results.
The O₃ is the ultimate cobra bag system for those who demand the very best in reflex training. Exceptional stability and rigidity deliver crisp, highly responsive rebounds, while the proven durability of the modular KEWLUS system has earned the trust of world champion boxers, respected coaches, and busy boxing gyms where ordinary cobra bags often fail within months. Refined through years of real-world boxing gym testing, the O₃ is a true boxer’s workhorse, built to perform at the highest level.
Target Ball: The Prime Target is made from genuine leather, designed for exceptional durability, feel, and rebound performance. Its shape is engineered specifically to match the KEWLUS Target Adapter, creating a uniquely locked-in connection that gives KEWLUS targets their signature crisp rebound feel instead of the loose, floppy response common in ordinary cobra bags. Built for real boxing gym use, KEWLUS leather targets develop the worn character of old-school leather boxing gloves while remaining exceptionally tough even after years of punishment. The modular system also allows targets to be swapped in seconds, adapting to specific training requirements.
Spring: The KS3 Striker Spring delivers the fastest and crispest rebound in the KEWLUS lineup, creating a sharper and more responsive training experience for high-intensity reflex work. Originally developed for faster, more demanding setups, the Striker quickly became a favourite among coaches and busy boxing gyms seeking a more explosive rebound feel. Its performance also led world champions Andrew and Jason Moloney, along with world cruiserweight champion Jai Opetaia, to request the Striker setup for the O₃, ultimately leading to the Striker becoming the standard spring in the O₃ Kit.
Base & Mast: The OctaBase is not just a base, but a fusion of engineering and art. Built from ultra-strong multi-ply wood panels in KEWLUS’s signature octagonal design, it delivers the most rigid platform of any cobra bag system. Combined with the Stainless Steel Mast, the OctaBase creates an exceptionally rigid platform designed for the ultimate cobra bag performance, durability and sustainability.
Assembly Instructions
The instructions below will help you with the correct assembly of the O₃ Cobra Bag Kit for optimum performance.
Step 1: Attach the Base Connector to the OctaBase
The first step is to attach the Base Connector to the OctaBase. You will find a bag of 8 long stainless steel screws. You have two options:
Upright with the arches of the OctaBase facing down - this will give you roughly an extra 5 inches of height. In most cases this is the ideal way to set up your base; or
Upside down with the arches of the OctaBase facing up - this will reduce the height, but the cavity will cup the sandbags a little better. This is better if you want a shorter cobra bag.
I recommend setting it up with the OctaBase in the upright position and use the height adjustment to lower the cobra bag to your needs. If your lowest setting is still not low enough, then you can try reconnecting with the OctaBase in the upside down position.
Placement on the floor: the base will work well on carpet, but if you're going to place it on a hard floor, consider using a very thin rubber mat. I've included a KEWLUS towel as a free gift - you could use that initially until you can find a suitable thin rubber mat.
Step 2: Insert the Mast & Tighten The Steel Clamp
Place the OctaBase on the floor and insert the Mast into the Base Connector while pressing both of the push button. Push it all the way in and twist until the buttons pop out through the holes in the Connector.
Once the buttons pop out through the holes in the Connector and the Mast is firmly in place, place the steel clamp over the collar and tighten it. Make sure to tighten it as much as you can, but only by hand. Check that the Mast is nice and rigid. From time to time check the clamp around the collar to make sure it is tight. The rigidity of the Mast will have an impact on the performance of your cobra bag.
Step 3: Insert the Click Bar into the Mast
Insert one end of the Click Bar into the top of the Mast while pressing on the two buttons on the Click Bar. Slide it down until the buttons pop out through a pair of adjacent holes in the Mast. By selecting holes at different heights gives you height adjustment.
Step 4: Mount the KS3 Spring onto the Click Bar
Press in the two buttons at the top of the Click Bar and mount the KS3 Spring onto it. Slide the Spring onto Bar until the buttons pop out through a pair of adjacent holes in the red Spring connector.
There are two sets of holes, allowing you a further fine adjustment of height.
Step 5: Insert the Click Bar or Red Bar into the Top of the KS3 Spring
The KS3 Kits come with two Click Bars, the second one for the top section of the cobra bag. For increased speed you can use the Red Bar, which is about 3 inches shorter and slightly lighter.
Swapping from using the Click Bar in the top section to the Red Bar can offer you greater variety in your reflex training.
Step 6: Assemble the Ball & Ball Adapter
Open the Velcro strap at the opening of the ball and unzip the opening all the way, revealing the bladder and the protective tongue. The tongue is there to reinforce the zip. The tongue is designed to lay flat between the diaphragm of the adapter and the zip, so pull the tongue out as you insert the adapter. Make sure that the bladder is sitting inside the diaphragm of the adapter and that the tongue is on the outside, just under the zip.
Note, that it is quite a tight fit, so you will need to push in the outer edge of the Adapter diaphragm with your thumb, while slowly working your way around until the whole diaphragm is in.
Once it's all in, adjust it so the tongue is on the outside of the diaphragm and then pull the zip as far as it will go. Note, in some targets like the Prime Target the zipper might not go all the way down - and to prevent the clasp from sliding up I recommend taping the bottom with electrical tape.
Using a ball pump (not provided) with a wet needle, inflate the ball to about half way and feel around by squeezing the ball to make sure that the bladder is where it should be in the center and not caught on the edge of the diaphragm. Do not twist the adapter as it may twist the bladder inside. Once you're satisfied that nothing is caught or twisted, inflate the ball fully until it is nice and firm. It should be firm, but not rock hard - it's important not to over-inflate it.
You can now mount the adapter with the ball on it onto the top section of your cobra bag. The Adapter has a number of hole pairs in the stem for adjusting the reach of your bag. There are also two hole pairs at the top end of the KS3 Spring just like at the bottom for fine adjustment of the reach length.
Step 7: Fill your Sandbags to Weigh Down Your Cobra Bag
The cobra bag will perform best if the base is properly weighed down. I have designed each sandbag to weigh roughly 45 pounds (20kg) when filled with sand. I strongly recommend lining the inside of each sandbag with a large, heavy duty bin liner bag to prevent the sand from seeping through the stitched seams.
As you fill the sandbag with sand, push the sand out to the sides and lift the bag occasionally to allow the sand to settle to the far end of the sandbag.
To mount the sandbags, disconnect the top part of the cobra bag so that just the Mast is left plugged into the Base Connector.
Important: When mounting the first Donut Sandbag, lower it carefully to avoid dislodging the metal clasp on the steel clamp of the Base Connector.
Optimum Tip: Using Olympic weight plates on top of the sandbags is another great way to increase not only weight, but also the rigidity of the Mast. For this I have designed a special Olympic Sleeve that comes with this kit and can slide onto the Mast and hold a weight plate or two firmly in place. I recommend using one 44LB weight plate on top of just one Donut Sandbag. I find that combination works well, but you can always add a second weight plate or sandbag if you need extra stability.
Make sure to check out my YouTube channel for more tips and ideas, as well as training videos and latest add-ons. I hope you enjoy the Kewlus cobra bag, and if you have any questions, you can ask Tim (bottom right) or use the Contact Page to get in touch with me.
Prime (KS3) Freestanding Kit
Assembly Instructions
The assembly instructions below will help you to correctly set up the KS3 Cobra Bag Freestanding Kit.
Step 1: Assemble the Paddles with the Base Connector
The first step is to assemble the Paddles with the Base Connector that will form the platform of your cobra bag. You'll need the following:
Set of 4 Paddles, which come with a bag of 8 small black screws and a large chrome screw and nut;
Base Connector, which comes with a steel hose clamp that fits around the collar of the Connector; and
Your favourite Phillips screwdriver (not provided).
If the Mast is already in the Base Connector, pull it out by loosening the steel clamp around its collar, push both buttons with one hand while twisting and pulling the Mast out with the other hand. Tip: to make it easier, place the Base Connector on the floor and stand over it with your feet partly over the sides to hold it down. Remove the steel clamp completely and then use one hand to push the two buttons on either side while twisting and pulling the mast out with your other hand. If it feels too tight, you can use a screwdriver through one of the top holes of the Mast for leverage - just make sure to firmly push in the two buttons before twisting.
Holding the Base Connector upside down, plug two of the Paddles loosely into it. Thread the chrome nut partly onto the chrome screw and position it in the center of the Paddles with the screw head on the outside with the bolt on the inside. Plug in the third and the fourth Paddle, sliding each one in under the screw head. Push all the Paddles all the way into the cavity of the Base Connector and tighten the screw. To stop the nut from spinning until it finds grip, use your finger on the inside of the Connector to hold it. Video: https://youtu.be/KJ2Or8SlQGM.
Once the Paddles are in place with the chrome screw secured in the center, screw in the 8 black screws through the top of the Base Connector into the Paddles. Do not overtighten the screws - they should be hand tight but relatively flush with the top surface.
Step 2: Insert the Mast & Tighten The Steel Clamp
Place the platform on a tiled floor and insert the Mast into the Connector while pressing both of the push button. Push it all the way in and twist until the buttons pop out through the holes in the Connector. Top Tip: if the fit is very tight, use a screwdriver through one of the top holes as leverage.
Once the buttons pop out through the holes in the Connector and the Mast is firmly in place, place the steel clamp over the collar and tighten it. Make sure to tighten it as much as you can, but only by hand. Check that the Mast is nice and rigid. From time to time check the clamp around the collar to make sure it is tight. The rigidity of the Mast will have an impact on the performance of your cobra bag.
Step 3: Insert the Click Bar into the Mast
Insert one end of the Click Bar into the top of the Mast while pressing on the two buttons on the Click Bar. Slide it down until the buttons pop out through a pair of adjacent holes in the Mast. By selecting holes at different heights gives you height adjustment.
Step 4: Mount the KS3 Spring onto the Click Bar
Press in the two buttons at the top of the Click Bar and mount the KS3 Spring onto it. Slide the Spring onto Bar until the buttons pop out through a pair of adjacent holes in the red Spring connector.
There are two sets of holes, allowing you a further fine adjustment of height.
Step 5: Insert the Click Bar (or optional Red Bar) into the Top of the KS3 Spring
The KS3 Kits come with two Click Bars, the second one for the top section of the cobra bag. As an option you can get a Red Bar, which is about 3 inches shorter and slightly lighter. The Red Bar can be used in the top section of the bag in place of the Click Bar. The Red Bar allows you to make the top section shorter and lighter, resulting in a faster rebound. The Click Bar on the other hand might be slightly slower, but allows for greater reach.
Swapping from using the Click Bar in the top section to the Red Bar can offer you greater variety in your reflex training.
Step 6: Assemble the Target Ball & Adapter
Open the Velcro strap at the opening of the ball and unzip the opening all the way, revealing the bladder and the protective tongue. The tongue is there to reinforce the zip. The tongue is designed to lay flat between the diaphragm of the adapter and the zip, so pull the tongue out as you insert the adapter. Make sure that the bladder is sitting inside the diaphragm of the adapter and that the tongue is on the outside, just under the zip.
Note, that it is quite a tight fit, so you will need to push in the outer edge of the Adapter diaphragm with your thumb, while slowly working your way around until the whole diaphragm is in.
Once it's all in, adjust it so the tongue is on the outside of the diaphragm and then pull the zip as far as it will go. Note, in some targets like the Prime Target the zipper might not go all the way down - and to prevent the clasp from sliding up I recommend taping the bottom with electrical tape.
Using a ball pump (not provided) with a wet needle, inflate the ball to about half way and feel around by squeezing the ball to make sure that the bladder is where it should be in the center and not caught on the edge of the diaphragm. Do not twist the adapter as it may twist the bladder inside. Once you're satisfied that nothing is caught or twisted, inflate the ball fully until it is nice and firm. It should be firm, but not rock hard - it's important not to over-inflate it.
You can now mount the adapter with the ball on it onto the top section of your cobra bag. The Adapter has a number of hole pairs in the stem for adjusting the reach of your bag. There are also two hole pairs at the top end of the KS3 Spring just like at the bottom for fine adjustment of the reach length.
Step 7: Fill your Sandbags to Weigh Down Your Cobra Bag
The cobra bag will perform best if the base platform is properly weighed down. I have designed each sandbag to weigh roughly 45 pounds (20kg) when filled with sand. I strongly recommend lining the inside of each sandbag with a large, heavy duty bin liner bag to prevent the sand from seeping through the stitched seams.
As you fill the bags with sand, push the sand out to the far corners and try to make sure you fill the bags all the way to the top. Once the bags are filled to the very top and are slightly bulgy, tie off the liner bags loosely and close the Velcro shutters.
Place one bag onto two of the Paddles right up next to the Mast and Velcro the handle traps around the Mast. This will prevent the bag from sliding off during training. Do the same with the other bag on the opposite side.
Top Tip: more weight is always better. Increasing the weight adds to performance. One way to increase weight is to add a second set of sandbags on top of the first. You could also use wet sand to make each bag about 20% heavier. The combined weight should be at least 90-100 pounds for solid performance.
Optimum Tip: Using Olympic weight plates on top of the sandbags is another great way to increase not only weight, but also the rigidity of the Mast. For this I have designed a special Olympic Sleeve that can slide onto the Mast and hold a weight plate or two firmly in place. One or even two weight plates can greatly enhance the performance of your cobra bag because they brace the Mast at a much higher point.
Make sure to check out my YouTube channel for more tips and ideas, as well as training videos and latest add-ons. I hope you enjoy the Kewlus cobra bag, and if you have any questions, you can ask Tim (bottom right) or use the Contact Page to get in touch with me.
Classic (KS2) Freestanding Kit
Assembly Instructions
The instructions below will help you to correctly set up the KS3 Cobra Bag Freestanding Kit.
Step 1: Assemble the Paddles with the Base Connector
The first step is to assemble the Paddles with the Base Connector that will form the platform of your cobra bag. You'll need the following:
Set of 4 Paddles, which come with a bag of 8 small black screws and a large chrome screw and nut;
Base Connector, which comes with a steel hose clamp that fits around the collar of the Connector; and
Your favourite Phillips screwdriver (not provided).
If the Mast is already in the Base Connector, pull it out by loosening the steel clamp around its collar, push both buttons with one hand while twisting and pulling the Mast out with the other hand. Tip: to make it easier, place the Base Connector on the floor and stand over it with your feet partly over the sides to hold it down. Remove the steel clamp completely and then use one hand to push the two buttons on either side while twisting and pulling the mast out with your other hand. If it feels too tight, you can use a screwdriver through one of the top holes of the Mast for leverage - just make sure to firmly push in the two buttons before twisting.
Holding the Base Connector upside down, plug two of the Paddles loosely into it. Thread the chrome nut partly onto the chrome screw and position it in the center of the Paddles with the screw head on the outside with the bolt on the inside. Plug in the third and the fourth Paddle, sliding each one in under the screw head. Push all the Paddles all the way into the cavity of the Base Connector and tighten the screw. To stop the nut from spinning until it finds grip, use your finger on the inside of the Connector to hold it. Video: https://youtu.be/KJ2Or8SlQGM
Once the Paddles are in place with the chrome screw secured in the center, screw in the 8 black screws through the top of the Base Connector into the Paddles. Do not overtighten the screws - they should be hand tight but relatively flush with the top surface.
Step 2: Insert the Mast & Tighten The Steel Clamp
Place the platform on a tiled floor and insert the Mast into the Connector while pressing both of the push button. Push it all the way in and twist until the buttons pop out through the holes in the Connector. Top Tip: if the fit is very tight, use a screwdriver through one of the top holes as leverage.
Once the buttons pop out through the holes in the Connector and the Mast is firmly in place, place the steel clamp over the collar and tighten it. Make sure to tighten it as much as you can, but only by hand. Check that the Mast is nice and rigid. From time to time check the clamp around the collar to make sure it is tight. The rigidity of the Mast will have an impact on the performance of your cobra bag.
Step 3: Insert the Click Bar into the Mast
Insert one end of the Click Bar into the top of the Mast while pressing on the two buttons on the Click Bar. Slide it down until the buttons pop out through a pair of adjacent holes in the Mast. By selecting holes at different heights gives you height adjustment.
Step 4: Mount the KS2 Spring onto the Click Bar
The KS2 Kit comes with a pair of black rubber Spring Caps. Screw each onto the end of the KS2 Spring until the end of the spring coil touches the far end of the rubber cap - feel for it with your index finger.
Slide the rubber cap on one side of the Spring onto the Click Bar until the push buttons pop out through the holes in the rubber cap. It's quite a tight fit, so you may need to put a little olive oil on the inside of the rim of the rubber cap and rotate clockwise as you slide it on. NOTE: always rotate clockwise, both for inserting and removing - clockwise rotation opens up the coils.
The rubber caps give the spring a clean look, but are actually optional. Another alternative to mounting the KS2 Spring is to simply insert it into the Click Bar and tape it in place using stretchy duct tape. The advantage of using tape is that you can tape the Spring at any position on the Click Bar. Having the Click Bar further inside the Spring will make it faster. Just make sure you have at least 5 active coils in the spring (coils between the top and bottom bar).
Step 5: Insert the Red Bar into the Top of the KS2 Spring
Insert the Red Bar into the top of the KS2 Spring until the push buttons pop out of the holes in the rubber cap.
If you're not using the rubber cap at the top of the spring, then insert the Bar until the push buttons are touching the spring and tape it in place with duct tape.
Step 6: Assemble the Target Ball & Adapter
Open the Velcro strap at the opening of the ball and unzip the opening all the way, revealing the bladder and the protective tongue. The tongue is there to reinforce the zip. The tongue is designed to lay flat between the diaphragm of the adapter and the zip, so pull the tongue out as you insert the adapter. Make sure that the bladder is sitting inside the diaphragm of the adapter and that the tongue is on the outside, just under the zip.
Note, that it is quite a tight fit, so you will need to push in the outer edge of the Adapter diaphragm with your thumb, while slowly working your way around until the whole diaphragm is in.
Once it's all in, adjust it so the tongue is on the outside of the diaphragm and then pull the zip as far as it will go. Note, in some targets like the Prime Target the zipper might not go all the way down - and to prevent the clasp from sliding up I recommend taping the bottom with electrical tape.
Using a ball pump (not provided) with a wet needle, inflate the ball to about half way and feel around by squeezing the ball to make sure that the bladder is where it should be in the center and not caught on the edge of the diaphragm. Do not twist the adapter as it may twist the bladder inside. Once you're satisfied that nothing is caught or twisted, inflate the ball fully until it is nice and firm. It should be firm, but not rock hard - it's important not to over-inflate it.
You can now mount the adapter with the ball on it onto the top section of your cobra bag. The Adapter has a number of hole pairs in the stem for adjusting the reach of your bag. There are also two hole pairs at the top end of the KS3 Spring just like at the bottom for fine adjustment of the reach length.
Step 7: Fill your Sandbags to Weigh Down Your Cobra Bag
The cobra bag will perform best if the base platform is properly weighed down. I have designed each sandbag to weigh roughly 45 pounds (20kg) when filled with sand. I strongly recommend lining the inside of each sandbag with a large, heavy duty bin liner bag to prevent the sand from seeping through the stitched seams.
As you fill the bags with sand, push the sand out to the far corners and try to make sure you fill the bags all the way to the top. Once the bags are filled to the very top and are slightly bulgy, tie off the liner bags loosely and close the Velcro shutters.
Place one bag onto two of the Paddles right up next to the Mast and Velcro the handle traps around the Mast. This will prevent the bag from sliding off during training. Do the same with the other bag on the opposite side.
Top Tip: more weight is always better. Increasing the weight adds to performance. One way to increase weight is to add a second set of sandbags on top of the first. You could also use wet sand to make each bag about 20% heavier. The combined weight should be at least 90-100 pounds for solid performance.
Optimum Tip: Using Olympic weight plates on top of the sandbags is another great way to increase not only weight, but also the rigidity of the Mast. For this I have designed a special Olympic Sleeve that can slide onto the Mast and hold a weight plate or two firmly in place. One or even two weight plates can greatly enhance the performance of your cobra bag because they brace the Mast at a much higher point.
Make sure to check out my YouTube channel for more tips and ideas, as well as training videos and latest add-ons. I hope you enjoy the Kewlus cobra bag, and if you have any questions, you can ask Tim (bottom right) or use the Contact Page to get in touch with me.
KS2 DIY Cobra Bag
The KS2 DIY Cobra Bag is where the Kewlus story began - giving people the option to make their own high-performance cobra bag using low-cost, off-the-shelf parts such as standard plumbing pipes, chipboard and a pool noodle. At the heart of the setup is the purpose-designed KS2 "Classic" Spring, which turns these simple materials into an exceptionally fast and responsive training bag.
Target Ball: The target ball is made from sections cut from a single pool noodle, which you can buy from Kmart for just a few dollars. Wrapped in an outer skin of duct tape, it delivers a very satisfying punching feel and rebounds beautifully. Because it is lightweight, it moves extremely fast. You can also add a little extra weight simply by applying more duct tape. Best of all, unlike a regular cobra bag target with an inflatable bladder, it never needs to be pumped up.
Spring: The KS2 "Classic" Spring has been refined over several years to deliver the fast rebound speed that works so well with the lightweight DIY target ball. I keep the price of this spring as low as I reasonably can, so more people have the opportunity to make and own a high-performance cobra bag.
Base: The base can be made by gluing together multiple MDF or chipboard panels using heavy-duty construction adhesive. I take the design a step further by cutting off the corners and reusing them as feet. This creates a base that is similar to the OctaBase in shape, height and stability, but without the price tag.
Part 1: Make the Top Section
Items You Will Need
KS2 "Classic" Spring
One pool noodle
Standard ¾″ PVC pipe (approximately 1.05″ outer diameter) - start with approximately 24″ in length
Wide, stretchy PVC duct tape
Serrated knife
Make the Target Ball
Cut a 6″ section from the pool noodle. This becomes the centre of the target ball.
Cut a second 12″ section of pool noodle and split it lengthwise.
Wrap each of the split sections around the 6″ centre piece and tape them firmly into place.
Cut an 18″ section of pool noodle and split it lengthwise.
Use one of these split sections to wrap around the middle of the target ball, then tape it into place.
Wrap a small amount of tape around one end of the PVC pipe to form a cone shape. This will make it easier to push the pipe through the centre of the target ball.
Thread the target ball onto the PVC pipe.
Using the wide, stretchy duct tape, wrap from the bottom of the target, over the top and back down to the bottom again. Repeat this one section at a time until the entire target is covered.
Choose the Top-Section Length
Start with approximately 24″ of PVC pipe. A longer top section gives the target a greater range of movement and works well for defensive training, but it will move slightly more slowly. A shorter section increases speed but reduces the range of movement.
I do not recommend cutting the pipe shorter than approximately 20″. It is best to start longer and shorten it later if you decide that you want a faster rebound.
Attach the Top Section to the Spring
Insert the PVC pipe approximately 2″ into the KS2 "Classic" Spring, then secure it tightly using the wide, stretchy PVC duct tape.
Part 2: Make the Mast and Base Connector
Items You Will Need
One length of 1″ galvanised pipe for the main mast
One short section of standard ¾″ galvanised pipe (approximately 1.05″ / 26.7 mm outer diameter) for mounting the spring
One 1″ to ¾″ reducing coupling
One galvanised flange sized to match the 1″ main mast pipe
Wide, stretchy PVC duct tape
Thick, long screws that fit through the flange holes for attaching the flange to the base in Part 3
Choose the Mast Height
Choose the combined length of the mast pipes so that the spring sits at approximately hip level and the target ball sits around shoulder or chin level. The top of the mast will generally sit around the top of your thigh.
Remember to allow for the height of the base when choosing the length of the main mast pipe. The DIY base in Part 3 will be approximately 5″ high.
Make the Mast
Use a 1″ galvanised pipe for the main mast. This gives the cobra bag a more solid base connection than using ¾″ pipe for the full mast.
Fit the 1″ to ¾″ reducing coupling onto the top of the main mast pipe.
Fit the short section of ¾″ galvanised pipe into the reducing coupling.
Insert the ¾″ pipe into the KS2 "Classic" Spring and secure the spring tightly using the wide, stretchy PVC duct tape.
Attach the galvanised flange to the bottom of the 1″ main mast pipe.
Prepare the Base Connector
When attaching the flange to the DIY base in Part 3, use the thickest and longest screws that will fit through the flange holes. This is one of the reasons the DIY base needs to be solid and approximately 5″ thick.
Optional Adjustable Upgrade
A galvanised-pipe mast is fixed at one height. If you later want an adjustable setup for different members of the family, you can upgrade to a KEWLUS Mast, Click Bar and Base Connector.
Part 3: Make the Base
Items You Will Need
MDF or chipboard panels, each approximately 18″ × 18″
Heavy-duty construction adhesive, such as Liquid Nails
Four heavy-duty screws with Allen-key or hex-bolt heads, sized to fit the holes in the galvanised flange
Drill and drill bit for pre-drilling the screw holes
Approximately 100 lb of weight, such as sandbags or weight plates
Optional: two fixed caster wheels for moving the loaded cobra bag
Optional: long reinforcing screws if caster wheels are added
Make the Base
Cut the MDF or chipboard panels to approximately 18″ × 18″. Do not go smaller, as this will compromise stability and performance. Going much larger can make it harder to place your feet close to the base while training.
For an octagonal shape, measure 5″ from each corner along both adjoining edges and cut off the corners. This creates eight sides of approximately 7″ each.
Keep the corner pieces. They can be glued underneath the base to add height and help prevent the base from sliding on carpet.
Glue the four main panels together using heavy-duty construction adhesive. If you are using laminated boards, allow several days for the glue to set properly before using the base.
Glue the saved corner pieces underneath the base in stacks of three. Use two stacks near the front and three stacks across the back to create a raised support structure.
Attach the Flange
Position the 1″ galvanised flange in the centre of the base.
Pre-drill the holes to reduce the risk of splitting the timber.
Use the thickest screws that will fit through the flange holes. Screws with Allen-key or hex-bolt heads are strongly recommended because they can be tightened with much more torque than standard Phillips-head screws.
Tighten the flange firmly and check that there is no movement.
Re-check the flange after a few days of training. If it begins to move, use larger screws. You can also add a small amount of glue into the screw holes before tightening the screws.
Add Weight
Add approximately 100 lb of weight to the base. A pair of sandbags will work, but a particularly rigid setup can be made using a round sandbag with a weight plate on top. Make a simple paper sleeve around the mast to fill the centre gap and keep the weight stable. This also helps protect the flange from excessive forces while training.
Optional Caster-Wheel Upgrade
For easier movement, attach a pair of fixed caster wheels to the rear edge underneath the base. Do not use swivel wheels. Position the wheels so the loaded cobra bag can be tilted onto them and rolled into place without removing the weights.
Reinforce the underside with long screws if needed, so the base can safely handle the heavy load while tilted onto the wheels.
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