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. This article will explore the benefits of using the powerball gyroscope. The speed of the device ranges from 2000 rpm to 16000 rpm and at this highest speed it is calculated that 40 lbs of resistance is being generated.The power gyroscope can be used in a fitness sense for the shoulders, wrists and arms helping to define muscle, build and tone. Using the powerball is simple but very effective resistance training. As you build up the speed of the device the forces generated against your arm build as well.