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.

Exerfly offers three main products: the Ultimate, the RackFly, and the 3x3 line (including the 3x3 Base Model, 3x3 7ft Rack, and 3x3 9ft Rack). We also provide a wide range of accessories for each product to customize your setup.

The best choice depends on your training environment and goals. The RackFly excels in portability for horizontal and rotational movements. The Ultimate offers compact, maneuverable versatility across vertical, horizontal, and rotational exercises. The 3x3 Base and 3x3 Rack Models form a solid training rig that blends both high impact traditional training and flywheel training.

Pricing varies by system and customization. You can visit the product pages for a starting price for our standard equipment packages. If you'd like a quote, please contact us.

All Exerfly products can hold up to 8 flywheels at a time. The maximum load is 8 large flywheels, or 0.8 kgm² inertial load.

Every Exerfly system comes with a base set of accessories included in the equipment package. We offer a wide range of additional accessories to expand your training capabilities and get the most from your Exerfly device. View our full range of accessories here.

Each Exerfly product supports hundreds of exercises across every movement plane. The RackFly specializes in horizontal and rotational movements like chops, pulldowns, and curls. The Ultimate enables a wide range of vertical and horizontal exercises such as split lunges, leg curls/extensions, and rows. The 3x3 Rack unlocks additional options including pull-ups, dips, and sprint first steps. You can view our exercise libraries for more examples.

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.

Exerfly devices are designed as complete, ready-to-use solutions, so on-site upgrades are not available due to high shipping and service costs. Choose your configuration upfront for the best long-term value.

By default, the Motorized Boost percentage is set to a maximum of 30% as a safety precaution. To access the full 1-80% range, please contact us.

We publish Exerfly case studies on our website here. Our case studies cover a range of flywheel applications across performance and rehabilitaion using both standard flywheel and Exerfly motorized flywheel training.

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 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.

Absolutely. Exerfly's resistance is entirely user-defined through inertia, automatically scaling to your effort and strength, making it safe and effective for all ages and experience levels when used with correct form.

The following performance metrics are provided in real-time via the Exerfly app:

• Mean Net Force (N)
• Mean Tangential Force (N)
• Mean Linear Force (N)
• Mean Torque (N·m)
  
• Mean Velocity (m/s)
  
• Mean Acceleration (m/s²)
  

Yes. All recorded data can be exported or shared with trainers, physiotherapists, or performance software for detailed analysis.

Yes, the Exerfly app works seamlessly on both iOS and Android devices.

No. Exerfly systems are designed for standard gym or home flooring. The RackFly is compatible with any size rack uprights, or can be mounted to any vertical structure such as a pole or tree.

No. The Ultimate Bench is a flat bench that cannot be adjusted. The Exerfly Adjustable Bench is an alternative bench option that is fully adjustable.

Yes. Exerfly’s resistance adjusts to your input, reducing the risk of using excessive load. We recommend beginners to flywheel training start with moderate loading and force while getting used to the unique resistance, and ensure they understand proper operation of the equipment prior to use. Thorough onboarding and one-on-one customer support are provided with the purchase of any Exerfly device.

Minimal. For safety, the rope will need replacing when signs of wear appear. Replacing the rope is quick and can be done in minutes.Spare rope is included in all equipment packages. View the video tutorial here.

You can watch a video tutorial on how to change the rope here.

We can recommend third-party financing options like leaseprocess.com, but Exerfly does not offer financing, leasing, or payment plans internally.

Yes, we ship worldwide. All Exerfly shipments are insured until the point of delivery. Orders are fulfilled and dispatched from the United States.

Lead times vary depending on order volume and location. Most orders ship within 1–6 weeks.

For international shipments, orders are sent DDP (Delivery Duty Paid), meaning all duties and taxes are included in the total purchase price at checkout. Customers located within the European Union are required to provide a valid EORI (Economic Operators Registration and Identification) number for customs clearance.

Exerfly provides a 2-year limited warranty on all equipment and a lifetime warranty on all steel frames and welded parts, effective from the date of receipt.
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If you experience an issue with your equipment, you must submit a claim to help@exerfly.com for assessment. Exerfly reserves the right to determine, at its sole discretion, whether a product issue is covered under this warranty.


This warranty does not cover:

• Damage resulting from misuse, abuse, accidents, or continued use after a defect is identified.
• Repairs or servicing not carried out according to Exerfly’s provided instructions.
• Use of non-OEM (original equipment manufacturer) parts or unauthorized modifications.
• Opening the unit or altering internal components without prior written authorization from Exerfly.
  
• Exerfly’s warranty is non-transferable and applies only to the original purchaser.
  

You can contact us through our contact form or via email: help@exerfly.com. Additionally, you can view our range of video tutorials on youtube and find a copy of the equipment manuals online.

Yes. Every Exerfly customer is paired with a dedicated applied sport scientist from day one. They are your main point of contact, providing onboarding resources and the option to book 1-on-1 setup calls. After that, you’ll receive free check-ins with your sport scientist every 90 days to ensure a smooth integration of Exerfly into your environment.