Instead of lifting a static weight against gravity, you accelerate a spinning flywheel. It returns resistance in proportion to the force you put in, so the harder you drive the concentric, the more eccentric resistance you receive.
You generate force to spin the wheel, activating muscle shortening like standing from a squat or deadlift.
The flywheel pulls back. You decelerate it, building strength as the muscle lengthens under load.
The flywheel reverses direction straight into the next rep, mirroring the change of direction demanded in sport.
Muscles can produce and absorb greater forces during the eccentric phase than during concentric. Flywheel training provides resistance through both phases, allowing these demands to be progressively trained.
Every repetition loads more than just muscle. Force travels through the entire musculotendinous system. Flywheel training provides resistance during both the concentric and eccentric phases, helping develop strength, force absorption, and efficient force transfer across the whole system.
Produces and absorbs force throughout the movement.
Transfers force between muscle and tendon during every repetition.
Stores and releases elastic energy while transmitting force efficiently.
From return to play through to refining athletic performance, the same system scales to the goal in front of you.
Flywheel training uses a spinning flywheel instead of traditional weights to create resistance. When you push or pull, you unwind the rope and accelerate the flywheel; the harder you push, the faster it spins and the more resistance you create. As the rope rewinds, the flywheel pulls you back with the same force in the opposite direction, so you must brake and control the movement eccentrically.
This creates a 1:1 relationship between the concentric and eccentric phases, providing constant, adaptive resistance throughout the full range of motion.
Essentially, anyone! From rehab patients and elderly users to high-performance athletes. Exerfly's resistance is entirely user-defined through inertia, automatically scaling to your effort and strength, making it safe and effective across the spectrum with minimal adjustments needed.
Unlike weights, Exerfly's resistance comes from inertia, scaling automatically with your effort rather than being limited by gravity. It's because of the effects of gravity that the eccentric phase is often underloaded with traditional weights. Exerfly provides equal or greater resistance in the eccentric phase and tension stays constant through the full range of motion rather than varying.
Exerfly stands out from other flywheel devices as the only system delivering true eccentric overload through optional Motorized Technology, enabling up to 80% eccentric overload on every rep. Exerfly products provide more loading capacity than any competitor with up to 0.8 kgm² of inertia (8x large flywheels) available at once. Most importantly, every unit is built to the highest standard of American manufacturing, crafted locally in Wisconsin.
Yes. Flywheel training is backed by extensive sports science research, and Exerfly itself is used by top teams and research institutions worldwide. You can browse a wide range of research studies here.
Exerfly Motorized Technology is an optional addition to any Exerfly product, used in both performance and rehab settings. The built-in motor adds extra resistance during the eccentric phase of every rep, while keeping resistance user-defined like standard flywheel training.
Add 1-80% more resistance than your concentric effort, increased in as little as 1% increments. This enables eccentric overload training at high velocities and forces to replicate elite sport demands and build injury resilience. It's recommended for athletes and advanced users seeking a unique training advantage.
We publish Exerfly case studies on our website here. Our case studies cover a range of flywheel applications across performance and rehabilitation using both standard flywheel and Exerfly motorized flywheel training.
Exerfly delivers superior eccentric loading that scales to what the patient can safely manage in each rep and stage of progression. This user-controlled approach makes it ideal for rebuilding strength and stability after injury, from early mobility through advanced strengthening. Rehab therapists worldwide adopt Exerfly because this approach accelerates recovery safely, matching eccentric stimulus precisely to the user's current abilities.
Flywheel resistance training is backed by years of peer-reviewed studies in sports science, physical therapy, and strength conditioning.
Flywheel resistance training calls for greater eccentric muscle activation than weight training.
Effects of flywheel vs. traditional resistance training on neuromuscular performance of elite ice hockey players.
Comparison of flywheel and pneumatic training on hypertrophy, strength, andpower in professional handball players.
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