Generally speaking, within half an hour after normal exercise, the heartbeat will be gray and normal. The shorter the recovery time, the stronger the heart function. Heart rate is a very complicated thing, which is related to weather, mood and physical condition. Judging from the situation you introduced, running until you can't move shows that the amount of exercise exceeds the limit. The heart rate of general exercise is controlled at 60%-80% of the maximum heart rate. For beginners, it is best to take brisk walking or jogging as the main way to improve cardiopulmonary function step by step.