She ispowered by muscle strength . In the heart of this ball is a rotor of 170 grams for a total mass of 256 grams.
When it is pressed, it appears rotation pulse around the axis . When the speed increases, the force to be supplied becomes larger, the muscles of the wrist, arm and shoulder are working more and more . It can thus generate the equivalent of 0.5 to 18 kg depending on the speed at which the rotor turns
Many record videos are available on Youtube, allowing everyone to compare and improve their technique and share it with others. It is advisable to use this device in a moderate way to avoid tendinitis or other inconveniences that are the consequences of overuse. Used at a low rotational speed, it becomes an effective rehabilitation and relaxation tool.