I taught my daughter how to pitch and to use proper mechanics beginning at age 9. At 10U travel she pitched well and could throw strikes. She was a smallish girl but could throw strikes and change speeds with the best of them. If you have a kid that is throwing with a less than optimal motion, then maybe pitching at 10U is not for her. I strongly disagree with the throw it hard and the control will come. I say throw it well and the speed will come.