Automatic rebound design: The ab roller wheel utilizes a unique mechanical structure that automatically rebounds during the rolling motion, making the movement smoother and more efficient. This design reduces the resistance during rolling, allowing you to have better control and mastery of the rolling action. | Strengthening abs and upper body: The ab stimulator primarily targets the abdominal muscles, especially the rectus abdominis. Additionally, this equipment can also exercise the muscles in the back, shoulders, chest, and arms, providing a comprehensive upper body workout. | Space-saving: The automatic rebound abdominal wheel is typically a compact and lightweight device that doesn't take up much space. It is suitable for home use and is easy to store and carry, making it convenient for workouts at home or while traveling. | Adjustable difficulty: The abs workout equipment often have adjustable difficulty settings. You can customize the rolling distance and speed according to your ability and workout needs, gradually increasing the challenge and intensity. | Improves core stability: When using the rebound ab roller for exercise, it requires maintaining core stability and control. This helps improve the strength and stability of the core muscles, enhancing posture control and movement skills. | Attention: This ab roller wheel does not come with batteries and requires LR1130 batteries, which need to be purchased separately.