As noted with SS... ground force resistance is the next topic... I think.. just need to organize my thoughts. All-in-all, by creating better coordination and getting your DD used to The Power Line (OP)... using a high knee drive, dorsiflexion, and positive forward angle (momentum) is going to increase her ground force resistance. Once she does this - and learns to absorb it correctly - you'll see some of this violence appear in the hips. It starts just prior to contact - and as she channels that energy up the torso, you'll see it. In the meantime - I'd make sure she has a solid foundation of core strength... heck... that might be the next post... lol I don't know... there's so much info I want share... oy vey...Then I noticed that her torso movements were just not nearly as strong looking as the other pitchers and I keyed on this hip move to see if maybe it was something to work on as a speed builder and thought I would throw it out to the group.