In physical education class teaching, there are always some students with poor physical fitness (physical fitness and basic activity ability). When they are doing exercises, they have poor flexibility, slow reaction, slow running, high jumping, short throwing, uncoordinated movements and poor sports performance. How to effectively improve the sports performance of these students is an important topic to improve the quality of physical education teaching. First, in-depth understanding of students' actual active guidance of students with poor physical fitness often has such a mentality that failing in physical education will not affect their further studies and graduation, as long as they have good grades in other majors, they can still graduate. Some people think that they are not "sports material", their movements in class are uncoordinated, and they spend a lot of effort, but their sports performance has not improved. After a long time, they lose confidence. On the one hand, teachers who teach the above-mentioned students should help them correctly handle the relationship between moral education, intellectual education and physical education, and correct their understanding of physical education class; On the other hand, we should analyze and study their characteristics from physiological and psychological aspects, find out their "personalities" and shortcomings, and then prescribe the right medicine, make plans and take measures. Some students with poor physical fitness have weak upper limbs, can't do a few push-ups, and can't support and swing on the parallel bars; Some have poor coordination and can't roll forward; Some splayed feet, running around; Some were timid and did it.