(1) Lie on your back, with your legs on the ground or stool and your hands on your sides to keep your body balanced and stable during exercise. Then put your legs together, straighten and lift up, and make 90 degrees with your body; Raise the upper body as high as possible, let the abdominal muscles and rectus abdominis contract as much as possible, and then combine slightly and repeat. Each group can repeat 15 ~ 20 times, inhaling each time the leg is forcibly lifted, and exhaling when recovering.

(2) Keep your body straight and supine, and press your hands on your sides to keep your body balanced. First, the upper body does not move, and the legs are straight and lifted upwards, making a 90-degree angle with the body; Bend your legs, put your knees in your hands, and press your abdomen hard, so that your abdomen and digestive organs can be well stimulated and recovered. Each group can repeat 15 ~ 20 times, inhaling each time the leg is forcibly lifted, and exhaling when recovering.

(3) Lie on your back, with your legs straight, your head leaning back, your hands behind your back, your upper body still, your legs straight up and back up, try to keep your feet touching the ground behind your head for 3 ~ 5 seconds, and repeat the reduction 10 ~ 15 times.

(4) Sit-ups lying on the ground or on a hard bed, feet fixed, arms straight behind your head, legs motionless, upper body lifted upward, and bent forward as far as possible, hands stretched forward as far as possible, hands holding toes as far as possible, until the abdominal muscles are extremely tense, and repeated reduction 15 ~ 20 times.