Abstract: A motorized treadmill exercising device comprising a generally planar frame equipped with a planar slider bed and head and tail rollers journalled respectively at the head and tail ends of the frame, over which an endless plastic belt is trained.

Abstract: A treadmill exercising apparatus comprising a generally planar frame equipped with an inclinable, planar slider bed, a driving head roller, and an idler tail roller, both journalled in the slider bed and respectively at the head and tail ends of the frame, over which an endless belt, formed by a low long term creep or stretch resistant synthetic resin extruded film, oriented of polyester or nylon, is trained, with the slider bed having a top slider surfacing formed from one of the same materials or from Masonite hardboard sheeting, across which the upper run of the belt rides, with the head and tail rollers each being formed from a rigid metallic material and provided with a belt centering crown, which, at least in the case of the driving head roller, is provided with an elastomeric coating or covering that defines the crown surfacing, whereby the coefficient of dynamic friction of the belt riding on the treadmill slider bed is no more than about 0.