Features: - Ultra-wide ab roller with built-in resistance and ergonomic handles to help maximize results of ab roll-out exercises. - Interior kinetic engine uses a carbon steel spring to provide resistance and amplify abdominal and arm workout. - 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 transport. - Includes high-density foam kneepad for superior comfort; downloadable 21-day workout plan. What's in the box 1 carver device