Ultra-wide ab roller with built-in resistance and ergonomic handles to help maximize results of ab roll-out exercises. The interior kinetic engine uses a carbon steel spring to provide resistance and  amplify abdominal and arm training. Ultra-wide wheel tread offers  stability when carving left, right or center for targeted work on obliques. Ergonomic hand grips are angled to activate arm and core muscles; handles are removable for easy storage and transportIncludes high-density foam kneepad for superior comfort.