Although many people do hundreds of sit-ups at a time, I suggest you choose the 2 14 exercises that are most effective for you, and only do three groups, 30 to 50 times in each group, and each group should be completely exhausted. My abdominal muscle training never exceeds 15 minutes. Weight: The greater the weight used by abdominal muscle training, the greater the possibility of irregular movements and the thicker the waist. The idea that gaining weight can burn more fat is wrong. So I suggest you use tension and control instead of weight bearing, and tighten and stimulate your abdominal muscles with your mind. Constant tension: when practicing abdominal muscles, keep the whole group of abdominal muscles constantly tense, and don't let them relax at the beginning or end of the action. Always reach complete exhaustion. Each group should be completely exhausted. Not counting the times. Keep doing it until your abdominal muscles can't contract any more. When you don't have to straighten your abdominal muscles completely. Don't arch your back, but hold your chest slightly. So as to concentrate the tension on the abdomen. The straighter the upper body stretches, the more power is exerted on the buttocks, which not only reduces the pressure on the abdominal muscles, but also increases the risk of lower back strain. Training action: I usually only use three exercises. And avoid monotony by changing their order frequently. Here are my three favorite sports: sit-ups: lying flat on the ground with your calves on the bench. Then shrink your shoulders and create an arc in your upper abdomen, as if to roll forward. Don't stretch your head forward when doing the action, just touch your legs, because this means that your back will leave the ground, so your hips will begin to share the work that should be done by your abdomen. When descending, I let my shoulders slowly return to the ground and never relax my abdominal muscles. Many people like to put their hands behind their heads when doing this exercise, but in most cases, all they do is pull their heads forward. I am used to putting my fist in front of me. Suspended leg lift: When doing this action, first of all, pay attention to avoid swinging, tighten your body and control the speed of action. In order to stimulate the intercostal muscles, my knees turn left and right, which also exercises the abdominal oblique muscles. The key to correct leg lifting is to extend your hips slightly forward. If you just lift your legs, of course it's comfortable, but it only stimulates your hips instead of your abdominal muscles. Do it my way. Exercise is hard, but it will completely stimulate your abdomen. The movement speed varies from person to person, but it is necessary to ensure that the leg release process is slow. To prevent shaking. Remember: your goal is to practice abdominal muscles. Instead of lifting your legs as much as you can. If you find it difficult to straighten your legs completely, you can bend your knees to do it. When the abdominal muscles become strong, then gradually straighten your legs and do it. Sit and lift your legs: This action can better stimulate the lower part of abdominal muscles. Sit on the edge of the bench, stretch your legs forward and down, lean back about 10 degrees, grasp the edge of the bench and keep your body balanced. Don't bend your knees, lift your legs. Until the toes are parallel to the eyes, then control. Control and tension are very important in the whole movement, and a slight negligence may lead to lower back injury. As the abdominal muscles become more and more tired, you can gradually bend your knees until you are completely exhausted. Many people like to lie flat on the bench to do this action, which will cause the hips and abdomen to twist the arc tension of the abdomen and concentrate more tension on the hips rather than the lower part of the abdominal muscles. Beautiful abdominal muscles depend on three elements: reasonable diet, aerobic training and regular abdominal muscle training.