$ 6,100 excl. tax

The LegFlexx is a one of a kind leg curl machine based on scientifically proven principles, packaged with one flywheel for resistance as well as a feedback module for monitoring progress in real-time and over the long term. The system accommodates training for hamstring strengthening, hypertrophy and rehabilitation.

No assembly is required upon arrival, unless you opt for one of the unassembled shipping options, which will include a detailed guide.

LegFlexx Machine

kMeter II


XL - 0.070 kgm²
- +

SKU: LEGFLX Categories: , ,


Machine includes:

  • LegFlexx with
    • Pre-attached Drive Belt
    • Built-in wheels and handles for enhanced mobility
  • kMeter II feedback system
  • XL Flywheel



The LegFlexx is a flywheel training device that expands users’ capabilities when it comes to training the entire hamstring muscle group. Its seated arrangement maximizes muscle hypertrophy, while its wide-ranging flywheel training benefits, such as unlimited and variable resistance, allow users to safely train at their own maximum capacities, given the machine’s adaptability to all kinds of strength levels from beginners and recovering physiotherapy patients to professional athletes.

The use of eccentric hamstring strengthening is the most researched and accepted method of preventing hamstring injuries, reducing the risk of primary and secondary injuries. It can result in a change of muscle physiology, even lengthening the biceps femoris long head muscle fibers.


Beyond the above mentioned benefits of eccentric training, the LegFlexx allows users to control range of motion, thereby enabling you to safely work on improving your end range strength and target weak points with isometric holds.

The phone holder on the LegFlexx will allow users to comfortably get instant feedback as they train with the kMeter II.

And lastly the mobility of the LegFlexx makes it unique in comparison with other leg curl alternatives due to its practical handles & wheels and absence of a weight stack. This makes the machine suitable for flexible facilities, circuit training, and more.

Additional information


LegFlexx Machine



Shipping options

No assembly (by default), Semi-assembled (detailed guide available), Unassembled (detailed guide available)


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)


115 cm (45.3 in)


103 kg (227 lbs)

Maximum weight allowed

350 kg (772 lbs)

Inertia range (standard)

XS, 0.005 kgm² – XL, 0.280 kgm²


Built-in kMeter II 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 II


kBox4 Pro, kBox4 Lite, kPulley2, LegExx

Available for

kBox4 Active


LegExx, kPulley2, kBox4 Active and all kBox4 Lite & kBox4 Pro devices produced since May 2018

Sample rate

10000 Hz (155 revolutions/second)



XL – 0.070 kgm²


kBox4 Pro, kBox4 Lite, kBox4 Active, kPulley2, kPulley Go, LegExx