Hey, I like upper body as the next guy, but I would appreciate a bit more proportioned and less emphasized.
That's my issue, they don't actually resemble swimmers. They looked more realistic during the flashbacks, you know, back when they had the bodies of adults!
Lets forget the fact that they were supposed to be in Middle-school
Now, it's clearly an aesthetic to pander, which probably won't bother most, but considering they spend so much time actually on the aspect of swimming, it just seems odd.