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[[Image:Gyrotwister.jpg|thumb|A gyroscopic wrist exerciser.]]
[[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]]
A '''gyroscopic exercise tool''' is a device used to exercise the [[wrist]] as part of [[physical therapy]] or 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, a person holding the device can accelerate the spinning mass to high revolution rates by moving the wrist in a circular motion.
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