2. Bend elbows and sit-ups. Lie on the mat with your knees bent, your hands behind your head and your abdomen always tense. Stretch your left elbow toward your right knee, do sit-ups, and lift your right knee toward your head. Similarly, the right elbow should do sit-ups with the left knee. These two movements are done in turn.
3. Stretch sit-ups. Lie on the mat with your knees bent, your head slightly tilted, your upper back slightly away from the mat, and keep your abdomen tense. Hands are naturally placed on the inner thighs. The left hand is naturally attached to the inner side of the left thigh, and the right hand is naturally attached to the inner side of the right thigh for sit-ups. Or put your hands on your thighs and move to your knees to do sit-ups.
4. Lift your legs at right angles. Lie flat, put your hands behind your head, lift your right leg until it is at right angles to your body, lift your left leg until it is at right angles to your body, and then slowly lower your left and right legs. Repeat the action.
5, leg lifts sit-ups. Hands spread out naturally, cross with the body, feet are raised at about 90 degrees with the body, hands are at the same time, do sit-ups, and fingers touch the outside of the calf as an action. Repeat the action.
6, chest sit-ups. Lie on your back, straighten your legs, put your hands naturally across your chest, lift your upper body to do sit-ups, not too much, and leave your upper back off the mat. Repeat the action.
7. Bend and stretch sit-ups. Lie flat on the mat and take sit-ups as the basic posture. When lifting, keep your hands in balance with the mat, reach out to your calves, and bend your knees at the same time. When you lie down, your legs are straight, and the whole person lies flat on the mat. Repeat the action.