Overview
The LegFlexx is a high-performance, flywheel-based seated leg curl machine designed by Exxentric to optimize hamstring training. Unlike traditional weight-stack machines, the LegFlexx uses inertia-driven technology to provide unlimited, variable resistance throughout the entire range of motion. This design allows for significant eccentric overload, a key factor in muscle hypertrophy, athletic power, and injury prevention. Its seated arrangement is scientifically proven to target the hamstrings more effectively than lying variations by working the muscles at longer lengths.
Product Page: Exxentric LegFlexx - Rogue Fitness
Key Features and Specifications
Resistance System: Flywheel-based kinetic energy (Inertia-driven).
Frame Construction: Laser-cut, powder-coated carbon steel.
Dimensions: 31.5” (Length) x 37.4” (Width) x 45.3” (Height).
Product Weight: 227 LBS (103 KG).
Max User Weight: 772 LBS (350 KG).
Inertia Range: 0.005 kgm² to 0.280 kgm² (Standard capacity).
Flywheel Compatibility: Accommodates up to 4 flywheels in 5 sizes (XS, S, M, L, XL).
Feedback System: Built-in kMeter II for real-time Bluetooth tracking of force, power, and energy.
Mobility: Integrated wheels and handles for easy transport.
Color: Space Gray.
Performance Benefits
Optimized Hamstring Growth: The seated 90° hip angle places the hamstrings in a lengthened position, which has been shown to result in up to 55% more muscle mass gains compared to prone (lying) leg curls.
Variable Resistance: The machine matches your force output instantly. The harder you pull during the concentric phase, the more resistance the flywheel provides during the eccentric phase.
Eccentric Overload: Enables superior eccentric training, which is the most researched method for reducing the risk of hamstring strains and improving sprinting mechanics.
Safe Training to Failure: With no weight stack to drop, athletes can safely push to absolute muscular failure. If you stop pulling, the flywheel simply coasts to a stop.
Compact and Flexible: At less than half the weight and floor space of a typical commercial leg curl machine, it is ideal for home gyms, circuit training, or professional athletic facilities.
Maintenance and Care
Drive Belt Inspection: The drive belt is the most sensitive component. Regularly check for signs of fraying or wear. If damage occurs near the end, the belt can be trimmed and reattached; otherwise, it should be replaced.
Hardware Tension: Due to the vibrations and forces generated by the flywheel, check and tighten all screws and nuts every 1–3 months.
Surface Hygiene: Wipe down the vinyl pads and frame with a mild soap solution or gym-safe disinfectant. Avoid abrasive chemicals that could damage the Space Gray powder coat.
Flywheel and Shaft: Ensure the flywheel knob is secured tightly before use and keep the shaft area free of chalk or debris to maintain a smooth rotation.
kMeter Care: Keep the sensor and your mobile device's Bluetooth connection clean and updated. Avoid exposing the internal electronics to excessive moisture.
Frequently Asked Questions
Q: How do I change the resistance on the LegFlexx? A: Resistance is changed by swapping flywheels. Heavier flywheels (XL) provide more inertia for strength work, while lighter ones (XS/S) allow for higher velocities to train power and speed.
Q: Does the kMeter app cost money? A: The kMeter II app is free to download on iOS and Android and pairs with the machine’s built-in sensor to provide real-time data on every rep.
Q: Is this machine difficult to move? A: No. Despite its robust steel build, it features built-in wheels and handles, allowing one person to easily tip and roll the machine across the gym floor.
Q: Can I use this for physical therapy? A: Yes. Because the resistance is 100% user-controlled and smooth, it is frequently used in rehabilitation for controlled loading of the hamstrings and tendons.