Pulse is used to monitor and control the intensity of exercise. In endurance training, it is common to use heart rate to control exercise intensity. The event intensity of endurance load can also be determined by the percentage of maximum heart rate reserve. If 60% of the population exercises with high heart rate reserve intensity, the target rate = resting heart rate +60% (group resting heart rate-resting heart rate). In intermittent training involving swimming and other sports, the heart rate is generally controlled within the optimal range of 120 beats/min ~ 150 beats/min. Adult fitness running can control exercise intensity by subtracting age from 170.