Flywheel training for Bodybuilders

Bodybuilders in competition form appear to be some of the strongest athletes on the planet with their muscular physiques and single figure body fat percentage. By incorporating flywheel training with the kBox or kPulley, their bodies can become even more chiselled and revered.

While there are many bodybuilding federations, one of the pioneers is the International Federation of Bodybuilding & Fitness (IFBB.) Their ethos is to develop muscles and body parts to their “maximum size but in balance and harmony”.


Flywheel training offers a higher level of intensity that adjusts itself to the user’s effort, offering efficient training. This efficiency is very important for bodybuilders who often have a reasonably short preparation phase of 12-16 weeks, and therefore need to maximise training results. This is especially relevant in between qualifying competitions and finals where they may only have a few weeks to make improvements to their physique based on judge’s comments.

Bodybuilding is all about aesthetics and symmetry, their bodies are their billboard with most of their income coming from sponsorships, whether it be supplement companies or appearance fees. By using the kMeter feedback system athletes are able to assess if they are training their left and right side equally, something not possible with traditional weight training. 

Athletes require the endurance to be able to hold maximum effort flexing contractions during a show which can be over a prolonged time. An IFBB show usually has three rounds, including one routine of “free posing” for approximately one minute and another round with at least seven mandatory poses,  where athletes are ranked in comparison to each other. While on stage they are often quite dehydrated due to cutting techniques and have been on lowered calories. This combined with being under bright lights, they can feel slightly weak. The high inertia of the kBox has been shown to lead to increases in maximum strength. By using a spotter assisted method it is possible to further overload exercises to increase the resistance applied in concentric contractions.

Traditionally, if bodybuilders sustain an injury to their upper limbs such as the shoulder or even finger it has made weight training difficult as they are unable to hold/grip a barbell or dumbbell. With the kBox and its variety of attachments including a harness, they are able to train to high levels even through upper limb injuries.



Bodybuilders train for hypertrophy, traditional weight training only sees resistance applied throughout a portion of the range of movement. With flywheel training, resistance is applied throughout the entire range of movement, making it a more effective method of training and seeing muscle growth through the entire length of the muscle.

The benefit of the kBox and the kPulley is that athletes can perform all exercises on the one machine, instead of needing one for each body part like conventional gym equipment. The portability makes it a perfect choice for athletes working out at home, in between their gym sessions. Bodybuilders often train twice per day to cover all body parts, by training with the kBox at home they can spare themselves the need to spend a second session in the gym, saving themselves valuable time. It also offers the perfect solution to a backstage solution to get a quick pre-show pump on. 

One of the key benefits of flywheel training is the use of eccentric training which is much easier to perform on the kBox compared to normal weight training. Eccentric training can help prevent injuries such tendinopathies and has been showing to lengthen the muscle fascicle that is being trained which is of benefit to a bodybuilder’s physique.



Go back to applications for sports performance.


kBox4 Active

Our entry level model for the serious personal trainer or demanding home user. The perfect tool in strength and rehabilitation at our lowest price point.

  • Entry Level Model
  • Holds 1-2 Flywheels
  • kMeter Compatible
  • Weighs 15 kg
  • Starting at €1 410 / $1 635
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kBox4 Lite

Offers the lowest weight and best portability which makes it perfect for frequent travel without compromising the training.

  • Enhanced Portability
  • Holds 1-4 Flywheels
  • Built in kMeter
  • Weighs 9.5 kg
  • Starting at €2 300 / $2 665
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kBox4 Pro

Our premium kBox model with the greatest versatility and largest performance area. It’s ideal for sports teams, premium fitness clubs and physiotherapy facilities.

  • Largest Performance Area
  • Holds 1-4 Flywheels
  • Built in kMeter
  • Weighs 15.5 kg
  • Starting at €2 990 / $3 465
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The kPulley2 is the ideal horizontal solution for improving strength by offering flywheel training for rotational and pull exercises.

  • Horizontal Model
  • Holds 1-2 Flywheels
  • Built in kMeter
  • Easy to assemble
  • Starting at €1 890 / $2 190
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