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Treadmill is a device generally for walking or running or climbing while staying in the same place. treadmills are not used to harness power, but as exercise machines for running or walking in one place. Rather than the user powering the mill the machine provides a moving platform with a wide conveyor belt driven by an electric motor or a flywheel. The belt moves to the rear requiring the user to walk or run at a speed matching that of the belt. The rate at which the belt moves is the rate of walking or running. Thus the speed of running may be controlled and measured. The more expensive heavy-duty versions are motor-driven (usually by an electric motor). The simpler lighter and less expensive versions passively resist the motion moving only when walkers push the belt with their feet. The latter are known as manual treadmills