My son recently turned 11. He’s a 4’ 9", 79 lbs. lefty with below average velocity. He recently topped out at 46 mph while being gunned from behind the mound at a high school baseball camp.
Mechanically he is sound, but like most kids his age he needs some work. He has some issues with rushing that cause his arm to drag and lose velocity, but, overall, he was pretty accurate at 44 and 46 ft. this past season with four pitches he uses regularly: 4-seam, 2-seam, circle change, and a tailing fastball.
My questions is simply what, if anything, can I do to increase his velocity. Beginning in August will begin long toss again after a month or two break this summer. He is working on some body weight excercises like push ups, sit up, etc. to build is upper body and core. Is there anything else he can do?