LegFlexx
From: $ 7,490 excl. tax
Ships in 1-3 days
The LegFlexx System is a dedicated Flywheel Training leg curl for isolated hamstring strengthening, injury prevention and rehabilitation. Designed for athletes, sports medicine professionals and performance facilities seeking objective eccentric hamstring training with integrated performance tracking.
You can choose how your machine is delivered:
- fully assembled and ready to train
- semi-assembled (final setup takes about 30–60 minutes, easy step-by-step instructions included)
Description
What is Flywheel Training?
Unlike traditional weights, Flywheel Training uses inertia to create resistance. The harder you pull or push, the more resistance the flywheel generates, automatically adapting every repetition to your effort. This allows you to train the lifting (concentric) phase with maximal intent while accessibly and safely emphasizing the lowering (eccentric) phase, helping you build strength, power and muscle more efficiently.
Learn more about How Flywheel Training Works >
About the LegFlexx System
The LegFlexx System is a dedicated Flywheel Training leg curl device designed for targeted hamstring strength, rehabilitation and athletic performance. Built around the scientifically proven seated leg curl position, it allows users to achieve an optimal leg curl with optimal hamstring stretch, precise adjustability, auto-variable resistance, seamless eccentric overload and measurable output through integrated kMeter performance tracking. Whether used for injury prevention, return-to-play work or athletic development, the LegFlexx System supports consistent progression with kMeter data.
Best for
- Elite sports teams
- Sports medicine clinics
- Physiotherapists
- Athletic performance centres
- Hamstring injury prevention programs
Key Benefits
- Isolated hamstring training
- Optimal seated position
- Fully adjustable range of motion for rehab and return-to-sports
- Adaptive resistance for every repetition
- Supports injury prevention and rehabilitation
- Integrated kMeter performance tracking
Why Choose a SingleExx System?
The SingleExx range is designed for focused lower body Flywheel Training, delivering adaptive resistance through dedicated leg training devices. Unlike general-purpose systems, SingleExx products isolate specific movement patterns to help users develop strength, improve performance and support rehabilitation with greater precision.
Whether targeting the quadriceps with the LegExx or the hamstrings with the LegFlexx, SingleExx systems provide seamless eccentric loading, auto-variable resistance, optimal adjustability and objective performance tracking for athletes, patients and everyday users alike.
 LegExx |
Best ForQuadriceps andLeg Extensions |
 Up to 6 XL flywheels with Advanced Flywheel Knob |
 210 lbs |
 Steel Chassis |
 Performance Tracking via kMeter |
 Isometric Training at any length |
 Adjustable Backrest Position & Angle |
 Moving Handles & Wheels for Enhanced Mobility |
 Eccentric Overload Grip |
 LegFlexx |
Best ForHamstrings andLeg Curls |
|
Up to 6 XL flywheels with Advanced Flywheel Knob |
 227 lbs |
 Steel Chassis |
|
Performance Tracking via kMeter |
 Isometric Training at any length |
|
Adjustable Backrest Position & Angle |
|
Moving Handles & Wheels for Enhanced Mobility |
Specifications
| SKU | LEGFLX |
|---|
LegFlexx Machine
| Manual | |
|---|---|
| Shipping options | No assembly (by default), Semi-assembled (detailed guide available), Unassembled (detailed guide available) |
| Color | Space Grey |
| Usage area | 100 x 145 cm (39.4 x 57.1 in) |
| Foot print | 80 x 95 cm (31.5 x 37.4 in) |
| Height | 115 cm (45.3 in) |
| Weight | 103 kg (227 lbs) |
| Maximum weight allowed | 350 kg (772 lbs) |
| Inertia range (standard) | XS, 0.005 kgm² – XL, 0.280 kgm² |
| Feedback | Built-in kMeter feedback system |
| Compatible flywheels | XS (0.005 kgm²), S (0.010 kgm²), M (0.025 kgm²), L (0.050 kgm²), XL (0.070 kgm²) |
| SKU | 18500 |
kMeter (built-in)
| Compatibility | All LegExx, LegFlexx, kPulley, kBox Active, kBox Lite & kBox Pro devices with magnetic sensor discs |
|---|---|
| Sample rate | 10000 Hz (155 revolutions/second) |
| SKU | O-0010 |
XL Flywheel x 2
| Flywheel sizes/inertia | XS – 0.005 kgm², S – 0.010 kgm², M – 0.025 kgm², L – 0.050 kgm², XL – 0.070 kgm² |
|---|---|
| Compatibility | kBox Pro, kBox Lite (excl. XL), kBox Active (excl. XL), kPulley Pro, kPulley Go, LegExx, LegFlexx |
| Color | Standard, Color Coded |
L Flywheel
| Flywheel sizes/inertia | XS – 0.005 kgm², S – 0.010 kgm², M – 0.025 kgm², L – 0.050 kgm², XL – 0.070 kgm² |
|---|---|
| Compatibility | kBox Pro, kBox Lite (excl. XL), kBox Active (excl. XL), kPulley Pro, kPulley Go, LegExx, LegFlexx |
| Color | Standard, Color Coded |
M Flywheel
| Flywheel sizes/inertia | XS – 0.005 kgm², S – 0.010 kgm², M – 0.025 kgm², L – 0.050 kgm², XL – 0.070 kgm² |
|---|---|
| Compatibility | kBox Pro, kBox Lite (excl. XL), kBox Active (excl. XL), kPulley Pro, kPulley Go, LegExx, LegFlexx |
| Color | Standard, Color Coded |
Additional XL Flywheel(s)
| Flywheel sizes/inertia | XS – 0.005 kgm², S – 0.010 kgm², M – 0.025 kgm², L – 0.050 kgm², XL – 0.070 kgm² |
|---|---|
| Compatibility | kBox Pro, kBox Lite (excl. XL), kBox Active (excl. XL), kPulley Pro, kPulley Go, LegExx, LegFlexx |
| Color | Standard, Color Coded |
