The permiers testing the powerball are difficult. We must understand that what is important to start the powerball is not the speed but a movement of very wide wrist. Once we managed to easily start turning the PowerBall, one quickly takes the game to want to bursts of speed but we are surprised by the real force that develops the gyroscopic movement. I think in the long time and with frequent use, this item helps maintain muscle tone of the upper limbs: arms but the trunk because we tend to contract the abs to focus on turning the Powerball.
The only comment I can make is that the grip, high speed becomes difficult and grip tape is not necessarily well placed and sufficiently wide. Indeed, I managed to make me a little bell so be careful finger well take the powerball. Then I found a bit noisy bearings ... I do not know if it is possible to change by other quieter.
So very friendly object that can combine the useful (physical activity) and pleasure (fun to break records with friends or his own records).
