1, legs together, hands shoulder width perpendicular to the training blanket.
2. Ensure that the cervical vertebra is perpendicular to the spine and look at the ground with both eyes.
3. Fix your feet on the ground with your toes.
4. Stretch one thigh backward and lift it upward.
5. Keep your body still and exercise only one leg. When you lean back, don't support on the ground and hang in the air. 10 is a group, and exercise with the other leg.