I've watched the Austin Wasserman videos and been working with my daughter for about a year now on throwing the ball harder. She has good body motion, arm path is solid and great follow through. But to me it looks like she's throwing an over hand change up. I've through it was that her wrist was weak so we've been doing stretching and strengthening but I'm not seeing the ball come out of her hand any faster. You can see when she's throwing the ball she's trying to throw it a 100 mph but it just doesn't have the zip. Has anyone else gone through this with their daughter? Any recommendations?