A treadmill system, comprises: a sidewall member comprising a rim member extending around at least a portion of an upper edge of the sidewall member and a hatch member that provides access to an area enclosed by the sidewall member; a base member; a support pole member; a handle member coupled to the support pole member that extends from an upper portion of the support pole member and that is removably coupled to the rim member of the sidewall member; a rotatable platform member comprising an exercise surface, a peripheral sidewall and an interior sidewall, configured to rotate around the support pole member; and a particulate substrate disposed on the exercise surface. The exercise surface of the rotatable platform member is configured to evenly distribute the particulate substrate between the peripheral sidewall and the interior sidewall.