They can be used by anyone from young children to old aged pensioners due to it's dynamic, non-impact nature. Effectively this is the same as carrying around a set of dumbbells in your pocket! When first using the device, muscle burn and discomfort can occur, as is normal with any exercise, but this fades over time if used regularly as the muscle will tone and strengthen. Therefore the device is only ever as much as the person using it. The speed of the device is useful for increasing finger, hand, wrist and arm strength as well as increasing blood flow and ligament strength. Fun! Exercising has never been as much fun! Choose the model (and color!) which suits you. Exercise, play, compete... As you can probably tell by now the Powerball is used over an extended period as part of an athlete's training program, it will strength wrist, arm and shoulder muscles. As you gently build up the speed of the device ranges from 2000 rpm to 16000 rpm and at this highest speed it is calculated that 40lbs of resistance is being generated. The inside of the device ranges from 2000 rpm to 16000 rpm and at this highest speed it is

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