The limit in long-distance running refers to the physiological limit state reached by the human body in long-term exercise, also known as the exercise limit point. In the process of long-distance running, when the human body reaches a certain intensity or time, there will be a series of uncomfortable symptoms, such as accelerated heartbeat, shortness of breath, muscle weakness, and the idea of giving up the race in consciousness, which shows that the human body has reached the limit state. At this point, if you want to continue running, you need to rely on strong willpower to overcome the limit.