This is a treadmill. (tread+mill)tread: a synonym of walk
mill: a machine used for grinding or crushing/steel roller used for impressions
Interesting fact: Treadmills were used as punishment in British prisons in the early 1800s.
The word treadmill, originally a type of mill operated by a person treading steps of a wheel to grind grain, now designates a piece of indoor sporting equipment for running without moving any distance. (wikipedia)
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