According to the theory of the threshold of exercise load value, to grasp the effect of fitness. The threshold of exercise load value is a measurement standard for determining exercise load according to a certain heart rate range. Although it is impossible to determine an absolute standard for the threshold of exercise load value because of individual differences, the differences among people with normal health levels are not significant. Therefore, the theory of the threshold of exercise load value for "determining exercise load by a certain heart rate range" still has universal guiding significance.