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A gyrosphere was a type of exercise device. It mainly consisted of three large purple rings that whirled, in a seemingly random sequence, when the machine was active. To begin a gyro-workout, a person had to strap themself into or be strapped into the center of the apparatus, standing on a platform, while the surrounding rings started to spin. Exiting the machine involved reaching down to the platform and waiting for the machine to come to a halt. (ENT: "Vanishing Point")
In an hallucination experienced by Ensign Hoshi Sato later the same year, she imagined Commander Charles Tucker III using Enterprise's gyrosphere to exercise and remarking, when she entered the gym, that she was upside down. Sato felt reluctant to try the machine because she frequently experienced motion sickness. After she apparently told Tucker she had recently been feeling like the laws of physics had been seeming "a little off" to her, he apparently joked that she was perhaps right not to go on the gyrosphere, as "the laws of physics don't apply in here either." (ENT: "Vanishing Point")