This kind of situation is very common, and it is not difficult to solve it, but we must stick to it. First of all, eat as much as you like, but! ! ! If you are not full, eat until you feel hungry. You will definitely be hungry, so you should eat 5-6 meals a day, and how to eat them in the morning, noon and evening. Between breakfast and lunch, between lunch and dinner, you can simply add meals, such as two pieces of bread, a glass of milk or a fruit, without being too complicated. I found that this way of eating is not only a way to grow muscles, but also very effective for thin belly. When the stomach gets smaller, it naturally gets smaller. Second, exercise. It is no use just doing sit-ups. It can help you tighten muscles, but it can't eliminate fat. Only through aerobic exercise, jogging, climbing or cycling can you lose fat. Time should be enough for each time, 40 minutes-1 hour. Aerobic exercise should not be too intense, too intense will become exercise of cardiopulmonary function, but the effect of reducing fat is not good. Keep talking while exercising. The speed of speaking is just enough for you to catch your breath. If there is a lot of fat, it is recommended to do aerobic exercise 3-4 times a week, and it is enough to lose fat twice a week. Of course, sit-ups should also be done, not too ordinary, three times a week is enough.