A pump track is a purpose-built track for cycling. It has a circuit of rollers, banked turns and features designed to be ridden completely by riders "pumping"—generating momentum by up and down body movements, instead of pedaling or pushing. It was originally designed for the mountain bike and BMX scene, and now, due to concrete and/or asphalt constructions, is also used for skateboarding, and accessible to wheelchairs. Pump tracks are relatively simple to use and cheap to construct, and cater to a wide variety of rider skill levels.