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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 device used to exercise the [[wrist]] as part of [[physical therapy]] in order to build palm, forearm and finger strength. 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 around a free-spinning mass, which is started with 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
== History ==
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