Don't be busy reading or having a rest when you are at home. Push-ups are also very effective if you can. Remember to pay attention to breathing and open your mouth as much as possible when doing it, which can also increase your vital capacity and strengthen your physical strength.
Actually, one thing is very simple. There must be military training in high school. When you come back from military training 1 week, you will definitely lose about 10 kg, and your physical strength will be obviously strengthened. You can refer to the requirements of military training. Don't eat in the morning, go jogging directly, have breakfast after you come back, and then for five minutes. Then you can rest at home, do some aerobic exercise and don't let your muscles relax.