Exxentric develops scientifically backed flywheel training devices like the kBox and kPulley, offering variable resistance and eccentric overload for strength and rehabilitation.
Exxentric is a Swedish company founded in 2011 specifically to develop and refine flywheel training technology. Their flagship products, including the kBox and kPulley systems, utilize the physics of inertia to provide unlimited and variable resistance. Unlike traditional gravity-based weights, Exxentric devices adapt to the force applied by the user, enabling eccentric overload—a method proven to enhance strength, hypertrophy, and injury prevention.
Used by elite athletes, physiotherapy clinics, and fitness enthusiasts in over 75 countries, Exxentric’s equipment is designed to be versatile, portable, and scientifically effective. The company also offers the kMeter feedback system and a dedicated app to track power, force, and energy in real-time.
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The resistance is generated by the inertia of the spinning flywheel. It automatically adjusts to the force you apply—the harder you pull, the more resistance the flywheel generates in return.
Eccentric overload occurs when the resistance during the lowering (eccentric) phase of a movement is higher than during the lifting (concentric) phase, a key benefit of flywheel training for building strength.
Yes, the kBox and kPulley are widely used in rehabilitation because they allow for controlled, variable resistance that adapts to the user's current strength capabilities.
The Exxentric App is available on the Apple App Store and Google Play Store for tracking workouts and connecting with the kMeter module.
Refer to your specific user manual for belt change instructions. Generally, it involves unwinding the belt from the shaft and releasing the locking pin.