yes, to a lot of students
God damn it. Nothing can be done here.
He's one of those gym teachers that thinks that giving you a lower grade without completely failing you will make you strive to be better and that it will help "build character."
Not much you can do here other than act like you've been "building character" around him.
(Or maybe it's some psychological tactic and he's trying to convince students that you shouldn't have to go all out and bust your ass just because you're not perfect. Maybe.)