Running heart rate above 190 beats/min is relatively dangerous. For normal people, the highest heart rate reached in the exercise, that is, the limit heart rate, usually running is not recommended to reach the limit heart rate. When running, the heart rate can be appropriately accelerated. The limit heart rate of normal people is 220 minus their own age, such as the limit heart rate of 30 years old is 220-30 that is 190 times / minute. At present, the world statistics can reach the highest limit heart rate is 210 times / minute. Therefore, an average adult male with a heart rate of 190 beats/min may experience paroxysmal supraventricular tachycardia, and it is advisable not to continue to exercise strenuously and to have an ultrasound and electrocardiogram of the heart to determine whether there is a heart lesion. Exercise and fitness should not be too strenuous, but should be gradual, so that the body can gradually get used to it. For healthy and fit people, it is recommended that the aerobic heart rate can be controlled at 120-180 beats per minute, starting with walking and gradually transitioning to running to achieve better exercise results.