Abdominal fat is mainly caused by sedentary. If you can't do outdoor sports, you should always stand. For example, when doing homework, you can get up and relax, eat as little as possible at dinner and don't eat snacks, so that you can control your weight first. Then, you can do several groups of push-ups or sit-ups before going to bed at night. If you have enough time, you can spend half an hour to forty minutes doing rhythmic exercise or stretching.