Description
You wouldn't think it from first glance, but a Power Ball is actually a carefully engineered piece of technology originally designed to improve the wrist muscles of those who regularly use it.
After initially setting the inner section spinning, rhythmic circular hand and wrist movements not only maintain the rotation, but also make it steadily faster. The increased centrifugal force makes it harder to keep the Powerball spinning at the faster speeds. PGA Tour golfer Padraig Harrington has been known to use the Power Ball to improve his wrist strength