I believe it's in one of the early posts in the I/R in the Classroom thread - there's a statement made (by BoardMember, IIRC) that the pronation/supination movement of the forearm is the fastest body movement.
I spent a good deal of time trying to verify that statement, learning about linear...
I have a 2001 team and we have been playing for about a year and a half. We are now moving up to 12U. I have never really worked on throwing mechanics and the girls and they have all kinds of different throwing patterns. We as a team decided to have closed practices to work on throwing...