Losing weight without spending money is exercise. If you can't control it well, you can play it, and you need a lot of exercise and a certain amount of food control. Recommend a Copenhagen cookbook. In 13 days, you will lose different pounds due to different constitutions. There is also fasting, which requires you not to do strenuous exercise, because you will feel dizzy. After fasting, you should slowly resume eating for a long time. In fact, losing weight is ultimately to control your mouth and be especially cruel to yourself. If it is not particularly fat, it is recommended not to lose weight during this period, which will affect your physical growth ~ just sauce ~