1. Leg retraction in sitting position: When doing this action, pay attention to chest extension and knees adduction.

2, bicycle step: when doing this action, pay attention to chest, feet turn around (as big as possible).

3. Frog Show: When doing this action, try not to touch the ground with your feet, raise your hands, stretch your arms and hold your chest.

4. Scissors legs: When doing this action, pay attention to raising your legs and straighten your legs as much as possible.

5. Hip-lifting: When doing this action, pay attention to your feet, lift your whole leg, lift your ass almost perpendicular to the ground, and don't turn over when lifting your leg.