Action one
1. Lie on the bed, bend your elbows and put them on your chest.
2. Slowly lift the upper body, with the chest perpendicular to the ground, arms straight and eyes up. Stretch rectus abdominis 10 second. Repeat 3 times.
Action 2
1. Lie on your back, with your hands open, your legs together and lifted, perpendicular to the ground. Keep your waist close to the ground and imagine your navel sinking to the ground.
2. Spread your legs wide, straighten to both sides, and then slowly retract your feet inward.
3. After the feet are closed, the knees are bent and the knees are close to the chest. Action 1~5 is repeated 8 times.