The force in a flywheel training exercise depends on a combination of the intensity you work with and the selected inertia. With a higher inertia, the motion will be slower and more controlled, and your muscle will be able to produce a higher force. With a lower inertia, the motion will be faster which also puts higher demands on skill, balance and technique.
The inertia resulting from the size and number of flywheels you select impacts the training adaption you get. Together with your workout intensity, the inertia chosen decides your Flywheel Workout Zone, which can include strength training, power training, eccentric overload and warming-up.
The kBox4 can be equipped with two or four flywheels simultaneously depending on the kBox model.
The flywheels are available in four different sizes:
- Extra Large: 0.070 kgm2 (for kBox4 Pro and kPulley only)
- Large: 0.050 kgm2
- Medium: 0.025 kgm2
- Small: 0.010 kgm2
The average first-time user typically starts with one large flywheel for most exercises.
The medium and light flywheels can be used both on their own for high-speed exercises and weaker individuals (such as for rehabilitation), but they can also be used to fine-tune the inertia at higher loads.