Treadmill
A treadmill
is an indoor sporting machine used to allow for running without
moving any distance. The word treadmill originally designated
a type of mill which was operated by a person treading steps of
a wheel to ground grain.
The principal
is a belt system (a motor or flywheel driving a circular run of
material) where the top of the belt moves to the rear so as to
allow a runner to run an equal, and necessarily opposite speed.
Thus the speed of the run can easily be set or measured (the rate
at which the belt moves is the rate at which the runner moves).
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