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[[File:Video of a complete use session with a gyroscopic exercise tool.webm|thumb|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. The demonstrated speeds are, in part, very high and not recommended for normal exercise due to the high resulting forces.]]
A '''gyroscopic exercise tool''' is a specialized device employed in [[physical therapy]] to enhance [[wrist]] strength, promoting the development of palm, forearm, and finger muscles. It can also be used as a unique demonstration of some aspects of [[dynamics (physics)|rotational dynamics]]. 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. 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. This tool is also used to train the wrist by professional athletes, as for instance climbers.
== History ==
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