User blog comment:WITHERBOSS 963/Clubs/@comment-26960073-20160604114636/@comment-3391671-20160618135126

Due to the nature of Yandere Simulator being based off the Japanese school system (to a given extent), clubs and teams are the same thing. For example, the baseball team would be called "baseball club" (野球部; yakyuu bu).

Thus a swimming club/team could exist.