Azure 50 Meters

The swimming team loses a race to an "idler" who doesn't want to go into the water, and the teacher blames the loss on the fact that the team has been eating too much and drinking too much. The teacher tells the students that they need to eat a balanced diet to stay healthy. He also tells them that Zhehai Qian has been allowed onto the team because he's a member of the school's reserve team, which is not allowed to compete in the swimming competition. The swimming coach is shocked at the news, but the teacher says that he'll have to drop out too if the other students don't change their minds.