It's good. Cai Zixing is currently the coach of the centroid physics competition, a famous g-m-c family (girl, mass, calculate), and an important participant in the natural selection liberation movement. Xu Xiaoyu, a great sportsman and international gold medalist, once commented: Cai Zixing can be described as a gold medal coach. Cai Shen has made great contributions to the popularization of physics competition, the introduction of basic physics competition knowledge and the all-round development of students' interest orientation, and enjoys a high reputation in major sports platforms. Later, he began to study and practice competition teaching systematically and enjoyed the teaching process. Teaching kept him innovative and young, so he went further and further on the road of competition teaching. However, in the end, he firmly embarked on this road because of a group of like-minded colleagues and classmates. They convinced Teacher Cai that it is meaningful to spread rational thinking and let everyone know the world better, and it is worth doing all the time. Due to Cai's talent, special efforts and years of immersion in the sports training industry, many questions can generally be answered at a glance, at least the idea of solving problems and the difficulty level are given. Most importantly, Teacher Cai can explain things that children can't understand in a very simple way, such as the theory of relativity.