Abstract: A system and method for increasing the velocity of an animal on a mechanical device using gravity and natural animal movement. According to a preferred embodiment, there may be a frame; six wheels rotatably attached to the frame; four foot links coupled to four of the six wheels; four foot supports connected to at least one foot link; and a coupling system in rotational communication with at least one foot link to translate the stepping motion of a horse into angular momentum. The coupling system may have at least one gear connected, by a chain, to another at least one smaller sized gear to increase the velocity. Different sized gears may be used to control the speed of the vehicle.