LegExx
Leg Extension
Unlike the kBox and kPulley multi-exercise devices, the LegExx sole purpose is to target the quadriceps muscle. Since the LegExx is built on the same scientifically-proven flywheel technology, it ensures maximized hypertrophy by providing 100% muscle stimulation in the quadriceps. With the same flywheel-feeling.
For injured or low mobility users (e.g. in the ACL rehab process), you can get strength gains in the quadriceps without having to worry about posture or complex multi-joint movements or overcompensating with other muscles, such as the glutes when doing squats.
Variations
The LegExx extension can be performed with restricted ROM, 2-1 overload option, self- and spotter-assisted overload using the kGrip attachment. The LegExx ensures a safe and maximal muscle stimulation in the quadriceps ensuring an effective workout without previous training knowledge.
Self- and spotter-assisted Overload:
Performed using the kGrip.
2-1 overload:
Performed by using two feet up in the concentric phase, resist with one foot in the eccentric phase.
Restricted ROM:
To ensure a rehabilitation patient restricts their ROM in the bottom position of a leg extension, the LegExx moving arm can be strapped with an attachment band to lock it into a desirable ending position. Caution! Read the user manual before attempting this LegExx extension variation to ensure correct execution.
Go back to exercises, or read more about the applications of flywheel training.
#LegExx
kBox4 Active
Kickstart your Flywheel Training with our entry-level model. The perfect device for strength training, rehabilitation, injury prevention, and training in general. Available with our free Flywheel Training app to design all your kBox workouts.

- Ideal for...
- • Home Gyms
- • Personal Trainers
- • Group Classes
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Broader range of resistance provided by the lightest kBox model, practical to pack and bring with you on the move. Its built-in kMeter feedback system allows you to monitor your progress in real-time.

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kBox4 Pro
The premium and best-selling kBox model with the largest performance area. Made for intense workouts and serious strength building exercises. Its built-in kMeter feedback system allows you to monitor your progress in real-time.

- Ideal for...
- • Professional Teams
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kPulley2
The kPulley unlocks a variety of horizontal movements, creating limitless training possibilities especially when combined with the kBox. Its built-in kMeter feedback system allows you to monitor your progress in real-time.

- Ideal for...
- • Professional Teams
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LegExx
The LegExx is optimized for leg extension training sessions. It aims to isolate and strengthen the quadriceps muscles and it comes with a built-in kMeter feedback system.

- Ideal for...
- • Professional Teams
- • Health Clubs
- • Physiotherapy Clinics