Sit-ups lie flat on the ground, hands crossed on the chest, legs slightly arched. Get up and lie down as usual, and repeat several times. As for the number of times, it can be decided according to personal physique. People who have poor physical strength or haven't exercised for a long time can use other help, such as hooking their feet with the help of a wardrobe drawer, or asking someone to hold down the instep to get up. In addition, stretching your hands forward or gently putting your head behind your back can help athletes get up easily. Although the effect is not as good as putting your hands across your chest, it is very suitable for beginners with beer bellies to practice. Sit-ups Do sit-ups with your feet crossed. 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. Bend your knees, lift your legs and lie flat on the ground, keep your hands close to the floor, raise your legs and bend your knees (the fatter your knees are, the more you can bend them), then put them down and repeat them several times, which will help to exercise your lower abdominal muscles. Sit on the floor with your knees bent and your legs lifted, with your hips as the fulcrum, your arms supported on the ground, your legs bent and lifted, and then put them down. Obese men can effectively contract the lower abdomen in this way. Side abdominal muscle training put one hand behind the ear, one hand close to the ground, and 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 the hips standing sideways can only be slightly raised, not too far from the ground, otherwise it will easily lead to back injuries. Bend your knees and lift your legs sideways. Use an armchair without a handle. Legs naturally fall to the ground, hands crossed on chest, knees bent and legs lifted. Similarly, the hips must be close to the chair surface, even if the legs are lifted sideways, they should be parallel to the chair surface as far as possible and should not be lifted too high. Repeat several times and be the other side. Lie on the ground with your knees bent sideways, bend your elbows to support your head, then lift and lower your knees with one leg, repeat several times, and then do the other side. This group of exercises can not only exercise the lateral abdominal muscles, but also strengthen the hip muscles, which is very suitable for men who want to keep fit. Hanging leg lifting exercises use the horizontal bar or parallel bars in the park, pull the horizontal bar with both hands, then lift your knees slightly and repeat. Don't shake your legs or straighten up when you exercise. This exercise is a good exercise to strengthen abdominal muscles.

-I hope I can help you!