Among the courses studied, swimming is the most interesting course, which can not only exercise, but also learn self-help skills. In order to avoid embarrassment, boys and girls attend classes in batches. However, compared with boys who like swimming lessons, many girls are afraid of swimming. Girls have various reasons, some say they are unwell, some say they hurt their legs before, and some say they forgot to bring their swimsuits. Some girls went into the dressing room, but they were still shy.