My son is a Freshman in High School and really wants to play college baseball. After reading all of the great posts on this site, I decided to give him an opportunity to “play up” at a prospect camp for the experience. He’s a big, strong lefty but young. He did a very nice job and turned a lot of heads. But, was told he needs to use his body (throws all arm). I’ve read through as many threads as I could on this site but I still don’t get it. How do you fix a kid throwing “all arm”?