LegExx
From: $ 7,490 excl. tax
Ships in 1-3 days
The LegExx System is a dedicated Flywheel Training leg extension device designed for targeted quadriceps strength, rehabilitation and athletic performance. Built for full adjustability, it helps users achieve precise mechanics, maximal output and an optimal stretch position in a stable seated setup, making it ideal for clinics, performance facilities and users who want focused knee extension training and measurable lower body development.
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 LegExx System
The LegExx System is purpose-built for targeted leg extension training, featuring adaptive flywheel resistance, seamless eccentric overload and a highly adjustable seated design to support precise alignment, perfect knee extension mechanics, and an effective stretch position. It supports everything from strength development and muscle growth to rehabilitation and return-to-sport training, making it ideal for both high-performance athletes and clinical settings. With integrated kMeter compatibility and a compact footprint, the LegExx System delivers consistent, measurable leg extension training for users of all ability levels.
Best for
- Rehabilitation clinics
- Professional sports teams
- Strength and conditioning coaches
- Performance centres
- Lower body strength development
Key Benefits
- Focused lower body Flywheel Training
- Adaptive resistance with eccentric overload
- Fully adjustable, stable seated training position
- Fully adjustable range of motion for rehab and return-to-sports
- Objective performance tracking with integrated kMeter
- Suitable for strength, rehabilitation and injury prevention
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 | LEGEXX |
|---|
LegExx Machine
| Manual | |
|---|---|
| Shipping options | No assembly (by default), Semi-assembled (detailed guide available), Unassembled (detailed guide available) |
| Color | Space Grey |
| Usage area | 100 x 139 cm (39.4 x 54.7 in) |
| Foot print | 80 x 108 cm (31.5 x 42.5 in) |
| Height | 110 cm (43.3 in) |
| Weight | 95 kg (210 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 | 18282 |
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 |
