Material: ABS, PVC environmentally friendly wheels, non-slip tread, more stable, safe, super smooth and noiseless ABS material, PVC environmentally friendly wheels, non-slip tread, more stable, safe, super smooth and no noise< br>Automatic rebound design, effectively protect muscle safety and prevent sports injuriesSmart brake system, install carbon steel spring, powerful and powerful Smart brake system, install carbon steel spring, powerful and powerful Ergonomic handle design, comfortable hand feel, non-slip and wear-resistant Abdominal wheels are used to exercise larger parts of the body such as the abdomen, waist, buttocks, and arms. Movement description: 1. When using the abdominal chakra to do movements, you need to kneel down with your arms forward and grasp the abdominal chakra. 2. Your arm should be at a 45 angle to the ground 3. Therefore, the exercise will include rolling the abdominal casters in front of you until the angle of your arm to the ground is approximately 30, or if possible 4. Once you reach this angle, you should return to your initial position by contracting your abs, arms, back, and buttocks. 5. If you are not flexible enough or your resistance is not developed enough, you should avoid too low, because,You may lack abdominal strength, which will force your back to curl to help you stand up 6. Improper execution of this action can cause back problems. The important thing is to inhale deeply when you work hard and exhale deeply when you release