This study took 40 undergraduates as the research objects(20 in the experimental group took the extended training course and 20 in the control group took badminton as the elective course of college physical education), and conducted an experimental study on the influence of extended training on the cohesion cognition of college students in class by means of questionnaire survey and experiment. The results show that there is no significant difference between physical education teaching and students' cognitio...