The third level of college students in China, that is, the third level of mass aerobics, is competitive aerobics. Competitive aerobics refers to the ability of athletes to complete complex and high-intensity movements continuously by completing difficult movements perfectly with the accompaniment of music. The third set of first-class college students in China generally refers to the third set of mass aerobics, which belongs to competitive aerobics. Accompanied by music, competitive aerobics shows the ability of athletes to complete complex and high-intensity movements continuously by completing difficult movements perfectly. Aerobics is to exercise the heart and lung function of learners through continuous low-level whole-body exercise for a certain period of time. When practicing aerobics, we should ensure standardization, flexibility and sense of rhythm. In the process of exercise, the position, direction and movement route of limbs must be accurate, and attention should be paid to muscle contraction and relaxation. The basic steps include one-word step, side-by-side step, step, point step, cross step and so on.