On the one hand, good education is conducive to showing the laws of individual physical and mental development and promoting physical and mental development; On the other hand, the law of physical and mental development restricts the way, way, content and opportunity of education.

The order of individual physical and mental development requires that education should promote individual development step by step.

The development of individual body and mind as a whole has a certain order, so does the process and characteristics of individual body and mind development. The development of individuals is continuous from low level to high level, showing a certain sequence. If the development of the body is from the head to the lower limbs, from the center to the edge, then the development of human movements is also carried out in the order from larger and thicker movements to smaller and finer movements.

The order of human development requires us to follow the order from concrete to abstract, from shallow to deep, from simple to complex, from low to advanced, step by step, and we can't "encourage young people" or "practice them critically", otherwise we will not achieve the desired effect and even destroy students' body and mind.