Built-in resistance that helps maximize muscle growth in the abdomen and arms. An "engine", consisting of a durable carbon steel spring, offers resistance to "unfolding" and assists in rolling backwards to enhance the activation of the abs and arms. Provides a complete torso workout. With an extremely wide wheel sole that increases stability, it is easy to move left or right to work sideways and adjust the workouts to be easy, medium or hard. It has ergonomic hand grips that are angled to activate the muscles of the arm and torso. The handles are removable for easy storage and transport.
-Provides simple yet effective practice
-Its small size helps it to be used both in gyms and at home
-Comfortable ergonomic handles for extra grip
-The wheel-shaped design allows for many techniques
-Strong inner spring with long life