You use your wrist in a circular fashion. Athletes of all levels can use the Powerball to build, tone and strengthen the muscles and ligaments in the hands, wrists, arms and shoulders. The gyroscope will respond with a rolling action and 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. You can even use it for fun, having competitions between friends, family or work mates to see who can get the highest score. The Powerball can be used in a fitness way to build muscle or for exercise and in a multitude of situations.Fitness - NSD Powerball is a dynamic handheld device. This means the powerball can be used by anyone with hands big enough to grip it. Medical and Chiropractic professionals are increasing advocating the use of Powerball gyroscopes and an excellent device to help with Repetitive Strain Injuries. When the Powerball is used over an extended period as part of an athlete's training program, it will strength wrist, arm and shoulder muscles. Fun! Exercising has never been as much fun! Choose the model (and color!) which suits

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