@dalehileman,
dalehileman wrote:But if muscle powered some call it a manual treadmill
Google will find you lots of stupid things that people say and do; that doesn't mean you have to copy them. Manual means "with the hands". I know it has come to be used by the iPod generation to distinguish actions performed by people from those performed by, or with the aid of machines, but to apply it to the ancient machine known as the treadmill, worked by the feet, as "tread" conforms, which has inspired a metaphor for unending tiring and demanding labour, just seems a step too far.