If there is no problem in the physical examination, it means that the physical fitness is too poor, and it is necessary to consider starting fitness. Considering that you can jump when you walk fast, you can first consider walking or walking fast every day. Take less exercise. I usually record my heart rate with a stopwatch in a quiet environment. When your physical fitness is good, you can consider aerobic exercise such as running, which can improve your cardiopulmonary function. Keep exercising for one year and your physical fitness will be greatly improved.