Abstract: An exercising apparatus for horses having a frame with a first roller rotatably attached to one end of the frame and a second roller rotatably attached to the other end of the frame. Support structure is attached to the frame between the first and second roller for supporting an endless belt, the support means including a substantially flat piece of ultra high molecular weight polyethelyne plastic material. An endless belt is disposed over the plastic material and is in direct contact therewith and around the first and second roller. A power assembly is provided for rotating the first roller, thereby causing the endless belt to move around the first and second rollers and over the piece of plastic material. Longitudinal grooves are disposed in the piece of plastic material and metal rods are disposed in the grooves and are operatively attached to said frame for grounding static electricity caused by movement of the endless belt over the piece of plastic material to the frame.