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 rotational dynamics. The non impact nature of the products combined with the soothing resistance of the spinning rotor have made them good rehabilitation devices for persons suffering from carpal tunnel syndrome, arthritis, RSI, bone breakage etc.
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. The shell almost completely covers the mass inside, with only a small round opening allowing the gyroscope to be manually started.
The Daily Omnivore 
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