In physical education classroom teaching, the psychological and behavioral changes of both teachers and students will have an impact on each other's psychology and behavior, especially the changes of teachers. Teachers' role in classroom teaching has two sides. Teachers' happy mood can improve students' interest in learning. In addition to playing their own roles, teachers should also play their students well, participate in exercises and games with students, laugh with students and make beautiful movements. Students regard teachers as classmates and friends, communicate with teachers and tell them their favorite activities, which greatly promotes students' active participation. At the same time, students regard teachers as mentors, and when they encounter difficulties, they will sincerely ask teachers for help. Therefore, the dual role of teachers in classroom teaching is an important condition to complete a happy physical education class.

Physical exercise is a combination of mental work and physical work, both of which are indispensable. Simple physical learning is not good for movements, and simple mental learning is not good for skills. Therefore, students can get twice the result with half the effort by learning various sports techniques and completing various movements in a natural and cheerful atmosphere. It is the creed of every sports worker to let happiness enter the physical education classroom.