The development of human body is a state of normal survival and good operation of individuals on the basis of following the laws of life. The core concepts of human development are health, physique and longevity. The basic factors affecting individual development can be divided into two categories: congenital factors and acquired factors. Physical fitness is the synthesis of physical, physiological and psychological energy, and it is an active means and effective method to promote human development. Physical fitness has a profound foundation in sociology, pedagogy, biology, psychology and aesthetics. Physical fitness plays a very important role in promoting the growth and development of various organ systems, developing physical exercise ability, improving human adaptability, developing intelligence and improving people's spiritual and social life quality.