Treadmills as muscle powered engines originated roughly 4,000 years ago. Their primary use was to lift buckets of [[water]]. This same [[technology]] was later adapted to create rotary grain mills and the [http://en.wikipedia.org/wiki/Treadwheel_crane treadwheel crane]. It was also used to pump water and power dough-kneading machines and bellows. | Treadmills as muscle powered engines originated roughly 4,000 years ago. Their primary use was to lift buckets of [[water]]. This same [[technology]] was later adapted to create rotary grain mills and the [http://en.wikipedia.org/wiki/Treadwheel_crane treadwheel crane]. It was also used to pump water and power dough-kneading machines and bellows. |