First, you have to move. There are many ways, such as brisk walking, jogging and conscious deep breathing during exercise. You don't have to restrict any exercise. Everything you do in life is exercise. According to your physical condition and age, gradually adjust your exercise style and amount. See what kind of exercise suits you or you like it. Stick to it, and your cardiopulmonary function will be improved and strengthened. Emphasis on persistence can be effective.