Adolescents are in the whole process of human growth and development of one of the very important stage, the state and society have a high degree of attention to the development of physical health of adolescents. But the investigation data shows that in recent years, our country middle school student physique health condition is not optimistic. Cross Fit training has the characteristics of diversified training content, short time, high intensity and all-round development. It can better meet the needs of physical activity of teenagers under relatively limited conditions. In this paper, the methods of literature review and logical analysis are used to explore the effect of Cross Fit on the physical health of adolescents, the purpose of this study is to provide useful reference for the improvement of the physical health level of adolescents and the optimization and development of training methods. The results show that Cross Fit can help adolescents develop multiple abilities together, lay a good physical foundation, improve their living habits and mental endurance, and promote communication, improve the enthusiasm to participate in sports and other functions.