It is an important task of physical education to cultivate college students' external beauty, cultivate good manners, appearance and self-cultivation and strengthen people's literacy and education in teaching practice. This paper discusses the positive effect of physical exercise on college students and its exercise methods.

Bodybuilding is a beautiful and elegant fitness project. Comprehensive training mainly combines classical, rhythmic, folk and national dances by stretching beautiful basic dance exercises (based on ballet), which can shape people's beautiful figure, cultivate elegant temperament and correct incorrect sense of security in life.

It can be said that it is the foundation of all sports and originated from the basic training of ballet, dance and gymnastics. Suitable for a wide range of people, especially for women. At present, in many colleges and universities, physical exercise has gradually become physical education class's golden partner, which has a particularly important influence on contemporary college students. It is generally believed that the role of physical exercise is:

Physical training and external environment stimulation: the persistence, coordination, speed and intensity of stimulation make the body in motion. In this state, the central nervous system will always be ready to mobilize the coordination and cooperation of various organs and systems. Regular physical exercise can improve nerve activity. In addition, the training form also needs fast and accurate movements, and fast and accurate movements can be commanded by the brain.

The advanced part of the central nervous system of the brain. Physical training, the brain and spinal cord and peripheral nerves to establish a fast and accurate response, the brain at any time to correct the action, storage of fine motor information. After repeated stimulation, people's understanding ability, thinking ability and memory ability have been improved, thus making the brain smarter. Therefore, regular physical exercise can enhance the function of the human nervous system and the working ability of the brain, making it healthier and smarter.

Physical exercise plays a great role in correcting body shape: although contemporary college students have excellent graduation results, many of them are rejected by employers because of their poor image and temperament. Therefore, after learning the lessons of the past, they also began to frantically look for the door to shape their perfect image. Therefore, yoga and aerobics are favored by college students.