My son was the opposite. Not a real big kid 6', maybe 170 when he graduated HS. He had been up to 91, but looked like he was just standing out there throwing with a buddy. I think it really threw batters off because he looked like he was just tossing a meat ball to them, but it was by them before they swung. Even in college, when he hit 93 nobody could believe that he was throwing that hard because he looked like he wasn't even working to get there. To this day I still think that if he had had a PC that had any real PC knowledge that he had 3-4 mph in the tank without much trouble. 2 years after he graduated (and hadn't pitched in 3) he went with a buddy who is an minor leaguer to his winter workout. Sat there for an hour watching his buddy throw....then got off his chair and with just a couple warmups he threw 101 on a pulldown lol.