See Wikipedia's guide to writing better articles for suggestions. This section's tone or style may not reflect the encyclopedic tone used on Wikipedia. This tool is also used to train the wrist by professional athletes, as for instance climbers. Once the gyroscope inside is going fast enough, the person holding the device can accelerate the spinning mass to high rotation rates by moving the wrist in a circular motion. The device consists of a tennis ball-sized plastic or metal shell surrounding a free-spinning mass, with the inner heavy core being spun up via a short rip string. It can also be used as a unique demonstration of some aspects of rotational dynamics. The demonstrated speeds are, in part, very high and not recommended for normal exercise due to the high resulting forces.Ī gyroscopic exercise tool is a specialized device employed in physical therapy to enhance wrist strength, promoting the development of palm, forearm, and finger muscles. Video showing the use - from starting the rotation with a 'shoestring' over various movements with the holding hand until stopping the rotor with the second hand. For other "powerballs", see Powerball (disambiguation). This article is about the gyroscopic exercise tool and toy.
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