Exxentric - In2 Equipment

Exxentric AB is a company developing innovative, science based training equipment and methods for strength and conditioning, including the kBox, used by performance coaches, personal trainers and physiotherapists worldwide since 2011.

Flywheel Training


Supported by scientific evidence, Flywheel training increases the effectiveness of your strength training by applying the inertia of a flywheel instead of simple gravity to create optimal resistance.

Whether your goal is to improve athletic performance, prevent or rehabilitate an injury or improve your general health and fitness, flywheel training and the kBox training device offers a number of important advantages.

The Kbox4 


kBox4 Pro systems include the premium kBox model, ideal for sports teams, premium fitness clubs and physiotherapy clinics.


The kBox4 Pro is set apart by its market leading maximum inertia, built-in kMeter II feedback system and larger surface area, loved by strength and conditioning coaches as well as physiotherapists and top level personal trainers.


The kBox4 Pro Platform is made in Sweden from powder-coated aluminium, with details made of anodized hardened carbon steel and aluminium, and high-friction rubber. It is available in three different colors (Anodic Brown, Jet Black and Midnight Blue). The large Pulley Block mounted on this model is designed to sustain frequent usage with many clients who exert large amounts of force in their flywheel training. The kBox4 Pro can simultaneously hold four Flywheels of up to 0.070 kgm² each, with the maximum inertia level being 0.280 kgm².

The LegExx 


The LegExx is a flywheel training device optimized for seated leg extension training. Besides the advantages offered by its variable resistance and eccentric loading capacity, the LegExx is uniquely mobile for a leg extension machine.

The kPulley2 


With the kPulley2, you work against the variable inertia of steel flywheels, instead of being limited by the direction of gravity when lifting weights. The kPulley2 is renowned for its genial application of eccentric overload in regular training as well as its variable resistance, both backed by growing scientific support.

It also offers a number of important practical benefits;


Versatile multi-purpose training device, for exercises training both upper body, core and lower body.



Its kMeter app-based wireless feedback system can be used to measure and save actual power output and more.

Exxentric for performance Sports


Flywheel technology is gaining more and more momentum in sports performance as athletes and coaches see the benefits of the Exxentric kBox. Scientists are gathering increasing evidence to support this method of training. The advantages of flywheel training in performance sports include physiological, practical, ergonomical and economical benefits. 


Physiological advantages


The physiological aspects of flywheel training using the kBox are that it offers a variable resistance that automatically gives maximal resistance all through the exercise and increased mass and strength in every angle. With the possibility of a high eccentric load or overload the effects on these parameters and performance greatly outperform traditional weights. Eccentric overload is much more effective to increase strength, speed and mass, especially in trained subjects.

At the same time eccentric training is very injury preventive. Many injuries occur during eccentric contraction, like hamstring strains, so by incorporating this in pre-season or rehabilitation will greatly reduce the risk of new or recurrent injuries.

Eccentric overload is also shown to increase type IIx MHC and volume of the IIX fibre, which means transformation of the muscle into a faster phenotype. With a digital feedback system, you can monitor your athletes’ performance and progression down to every repetition.

Practical advantages


A practical advantage is that with the variable resistance your athletes don’t have to change weights between sets, users and even exercises. Shorter or taller athletes can easily workout together without having to change the height of the rack. This makes sessions more efficient and saves time for other important aspects of the athletes’ training, like resting, eating, tactics or play.

Using a harness for lower limb exercises the athletes can work at their highest performance and not be limited by any injuries in hands or arms or by inadequate technique. The harness unloads the upper back from point pressure and the lower back from torque which allows the athletes to focus on their performance instead.

Another practical advantage with the kBox is its mobility. Only weighing about 23 kg (50 lbs) with accessories, you can bring it into the field, into the locker room or on your trip or camp just like you bring your water bottles. Start combining heavy lifting or power training with your sprints, jumps or game play in a completely new way.

Ergonomical advantages


The ergonomical aspects are that there is no metal-to-metal sound, no risk of collision or dropping weights on the floor. This also results in less need for space and sound-reducing materials to work out, and you and your athletes can focus on the performance.

Economical advantages


With the above advantages, the economical advantage becomes obvious. With a single device offering over 30 exercises, mobility, safety and efficacy with the same or lower price than a complete barbell set you really get your moneys’ worth, and you hardly even need any extra space.




The kBox can solve your problem as a rehab clinician offering safe, controlled and effective training for all of your patients.


The clinician working with rehabilitation must have a comprehensive tool box to serve patients with a wide range of physical conditions, pain and performance levels, mobility and so on. Thus, flywheel training on the Exxentric kBox fits in perfectly.


ADDRESS: 468 Princes Highway Noble Park Victoria 3174

TELEPHONE: Peter +61 451 004 922

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