Never learn to diet from adults, it's not reliable. Junior high school students are in a critical period of growth. Excessive demands on diet control will affect physical development and may not grow tall. Therefore, it is good to exercise to lose weight, because if you want to lose weight here, it will also stimulate your height. I suggest you stick to the combination of strength training and aerobic exercise every day. In other words, you should do strength training for the parts you want to lose weight. It is best to have dumbbells at home and learn to do dumb bell exercises with videos, or you think it is very useful for slimming. Some only need to do it for five minutes, others need longer, limited to the time you can persist. Aerobic exercise such as playing ball, kicking shuttlecock, jogging, walking, etc. Sticking to it for more than 30 minutes will burn fat.