There is no best exercise method for cardiorespiratory fitness, you need to choose the suitable exercise method for yourself according to the physical condition of the specific people, you can’t generalize. 1. For healthy young adults, you can choose running, swimming, cycling, climbing, ball games and other aerobic exercise, standardized, long-term aerobic exercise can enhance the heart’s contraction capacity, improve cardiopulmonary function. 2. For the healthy elderly population, you can choose jogging, tai chi, eight-duanjin and other aerobic exercise for cardiopulmonary function. The intensity of these exercises is moderate, you need to control the time, step by step, so that the cardiopulmonary exercise in their own body within the scope of tolerance, can avoid the body is too tired to cause discomfort symptoms. 3. For patients with chronic diseases, you need to carry out aerobic exercise, breathing training, stair climbing and other methods of cardiorespiratory exercise under the guidance of a professional doctor or rehabilitation trainer, pay attention to the monitoring of the heart rate during exercise, and do not exercise on your own, so as not to cause other injuries. Each person’s physical condition is different, the way to exercise cardiorespiratory function is also different, you need to develop a suitable exercise method according to your own condition. Chronic disease patients need to strictly follow the doctor’s instructions for exercise, not blindly follow the example of others, so as not to cause other injuries.