According to the heart rate, (220-20)*0.8= 160.

Exercise with heart rate 150 beats/min is aerobic exercise, because blood can supply enough oxygen to myocardium at this time; So it is characterized by low intensity, fast pace and long duration. It is required to exercise for at least 30 minutes at a time and insist on 3 to 5 times a week.

This kind of exercise, oxygen can not only fully burn (that is, oxidize) the sugar in the body, but also 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. Therefore, if you are overweight and want to lose weight through exercise, it is recommended to choose aerobic exercise, such as jogging and cycling.

Extended data:

Benefits of aerobic exercise:

The purpose of aerobic exercise is to enhance cardiopulmonary endurance. In the process of exercise, due to muscle contraction, a lot of energy and oxygen are needed, and the demand for oxygen increases. The number of heart contractions, the amount of blood pumped out each time, the number of breaths and the degree of lung expansion all increase.

Therefore, when the exercise continues and the muscles contract for a long time, the heart and lungs must strive to provide oxygen to the muscles and take away the waste in the muscles. And this constant demand can improve the endurance of the heart and lungs. With the increase of cardiopulmonary endurance, the body can engage in longer or higher-intensity exercise, and it is less likely to get tired.