Exercise. Aerobic exercise. Running, cycling and swimming. It is best to add some muscles and increase basal metabolism through some strength training. People are not fat but have stomachs. It's simple. Because you are fat. Not visually. It comes from health data. Whether people are fat or not depends not on appearance, but on body fat. People who are not fat mean no muscles, even if they look thin. That's because the bones are covered with fat. High body fat and slow metabolism. Visceral fat will exceed the standard. Where does visceral fat accumulate? Around the viscera, of course. Internal organs are in the stomach. Therefore, it is normal for people to be big in thin belly. Once people exercise, the first fat they consume is visceral fat. So many fat people find that their stomachs get smaller first when they exercise. This is not because the abdominal fat has fallen off. It is the visceral fat that connects the blood that is metabolized first. The internal organs have become smaller, and the stomach has shrunk. So I don't want to say more. Can only say that thin belly's statement is unhealthy. Very unhealthy. Not even as healthy as fat people. Fat people need to keep their weight balanced. Although fat, but more muscles. Muscle brings basal metabolism. Rapid basal metabolism leads to relatively high immunity. So many fat people who are not too overweight are healthy. Even many of these fat people are very flexible. On the contrary, it is you. A thin belly is better than an old man. There is no muscle in the body, and the basal metabolism almost stops. Low immunity. At this rate, it is easy to get three highs. In addition, as a fitness expert. I can tell you very clearly. Sit-ups are useless. It will also hurt the spine. Exercise is systemic. Local exercise will not have any effect. There are only three kinds of sports. Strength movement, that is, stretching iron. Aerobic exercise, running, cycling and swimming. Stretching, yoga. The so-called thin belly that only practices sit-ups is imagined by people who don't exercise. In addition, I am responsible for telling you that I recommend you to pull the iron instead of turning you into King Kong Barbie. Even if you want to, you don't have androgen. Many male bodybuilders can't build large muscles without taking hormones, let alone a woman. It is very important to exercise muscles and increase basal metabolism. With muscles, you don't have to avoid eating whatever you want. Basal metabolism means that you are still burning calories without exercise. Muscles are like engines, and calories are like gasoline. You can search the body pictures of female fitness instructors. The difference between them and you is that. People should be soft, such as breasts. Where it should be hard, it should be hard, such as the arm. Where it should be tilted, such as the hips. Tighten where it should be tightened, such as the thigh. Look at yourself. Breasts may be the only thing you have in common with others. Touch your soft arms like water, your fat and ugly ass, and your baggy radish legs that are growing sideways. How dare you call yourself thin? Finally, add one point. Whether you are fat or not depends on body fat, not weight. Many thin people who exercise weigh more than 100 kg. Many fat people who don't exercise have the same weight. The volume of a kilogram of fat is about four times that of a kilogram of muscle. So your weighing scale really can't prove that you are thin.