First: sit-ups.
Cross your feet and do sit-ups. The difficulty is higher than the first group, and the effect is stronger than the first group. This group is an ideal exercise if you want to strengthen the upper abdominal muscles. In addition, you can also use a round stool instead of lifting your legs: take a round stool with a moderate height and put your feet on it, keeping a 90-degree right angle with your body. This can reduce the burden on beginners, but the effect is the same as that of people crossing their legs.
Second: Bend your knees and lift your legs.
Sit on the floor with your hips as the fulcrum, hold your arms on the ground, bend your legs and lift them, then put them down. Obese men can effectively contract the lower abdomen in this way.
Third: Side abdominal muscle training
Put one hand behind your ear and one hand close to the ground. Do sit-ups in the left and right directions, and repeat several times. When doing this group of movements, the back must be close to the ground and sideways.
The hips that get up can only be slightly raised, not too far from the ground, otherwise it will easily lead to back injuries.
Fourth: Bend your knees sideways and lift your legs.
Lie on your side, bend your elbows to support your head, then lift your knees with one leg and lower them. Repeat several times and do it on the other side.