The maximum heart rate tolerated by each person is different, depending on the individual’s health condition and heart function. A normal person can tolerate a maximum heart rate of 180 beats per minute, but if the heart function is not good, only 140 beats per minute or even less can be tolerated. If the maximum heart rate is exceeded, there will be insufficient blood supply to the organs, such as insufficient blood supply to the brain, there will be dizziness, darkness and even fainting, insufficient blood supply to the heart and coronary arteries, it will cause myocardial ischemia, hypoxia, and even myocardial infarction, and in serious cases, there will even be sudden malignant arrhythmia and cardiac arrest, leading to sudden death. Insufficient blood supply to the kidney will lead to kidney failure, insufficient blood supply to the digestive tract will lead to digestive insufficiency, insufficient blood supply to the lungs will cause ischemia and hypoxia in the body, resulting in serious systemic hazards.