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The principle is a belt system (an electric 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). One exception to the belt system is a track system used by Woodway USA treadmills. This system is similar to tracks used on military tanks.
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