Water Boys

Suzuki is the only member of the swimming team at Tadano Boy’s High School... until the new swimming teacher arrives and she is an extremely "hot babe". Suddenly everybody wants to be on the swim team... until they discover that what she teaches is Synchronised Swimming. Apparently, this is considered an extremely non-manly thing to do in Japan. Only five pupils decide to stick with it anyway, for personal reasons that you will discover through the course of the movie. Everyone laughs at them, ridicules them and above all doubts them... so naturally the impetus to succeed is strong. (IMDb.com)