Aerobic exercise, also known as aerobic metabolic exercise, refers to physical exercise carried out by the human body under the condition of adequate oxygen supply. That is to say, in the process of exercise, the oxygen inhaled by the human body is equal to the demand, achieving physiological balance. So it is characterized by low intensity, fast pace and long duration. It is required that the exercise time should be no less than 1 hour, 3 ~ 5 times a week. This kind of exercise, oxygen can fully ferment the sugar in the body, consume the fat in the body, enhance and improve the cardiopulmonary function, prevent osteoporosis, and adjust the psychological and mental state, which is the main exercise mode of fitness. Common aerobic exercises include: walking, jogging, skating, swimming, cycling, playing Tai Ji Chuan, dancing, doing rhythmic exercises, etc.