Gyroscopic exercise tool: Difference between revisions

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{{about|the gyroscopic exercise tool and toy|the US lottery|Powerball|other "powerballs"|Powerball (disambiguation)}}{{More citations needed|date=August 2024}}[[Image:Gyrotwister.jpg|thumb|A gyroscopic wrist exerciser.]]

[[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. 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 used in [[physical therapy]] to improve wrist strength and promote the development of palm, wrist, 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 an inner heavy core, which can be spun by a short rip string. Once the [[gyroscope]] inside is going fast enough, the person holding the device can accelerate the spinning mass to highhigher rotation rates by moving the wrist in a circular motion. The force enacted on the user increases as the speed of the inner gyroscope increases.

==Mechanics==