I knew a coach (place and location will remain unnamed though it was a large center with tons of kids and he was one of the main guys) where when he was feeding balls and the student hit a shot that almost hit the back fence he'd say stuff like "Good, keep going" "Nice try, that's it" in essence rewarding effort but to defend him a bit when you got many kids on your court its difficult to ask in depth questions. Still kinda funny as even the students would comment on it and chuckle.
Throughout your life advance daily, becoming more skillful than yesterday, more skillful than today. This is never-ending. - Hagakure