The maximum heart rate of normal adults is (220-age) beats/minute, and the maximum heart rate of the elderly or patients with coronary heart disease, arrhythmia, etc. is (170-age) beats/minute. Normal people’s heart rate is 60~100 beats / min, some long-term persistent athletes have a slower heart rate, infants and young children have a faster heart rate. Different ages and genders have different heart rates. In the process of exercise, the heart rate should be controlled within a tolerable range, excessive exercise resulting in a rapid heart rate will have adverse effects on the body. Especially in the elderly, too fast a heart rate will produce myocardial ischemia and hypoxia, angina pectoris occurs. Excessive exercise can also cause insufficient cerebral perfusion and symptoms such as fainting and blackout. Therefore, it is important to try to keep the heart rate in a stable state and safe range. If the heart rate is abnormal, prompt medical attention is recommended.