I'll add my two-cents worth, my focus is on the arm. The battle cry of this forum is IR, the rotation of the forearm. The initial pivot point is the shoulder, as the arm rotates through the back (past nine o'clock) the upper arm will stabilize against the rib cage and rotate the forearm. Your DD arm never establishes a secondary (and much faster) pivot point around the elbow. I've built a clip focusing on that slight pause of the upper arm against the rib cage and mixed in a clip from your daughter for comparison. It's subtle but very important for whip."
That is a great teaching video - MD- thank you for sharing your DDs video- and WillyT thank YOU for building this.
MD you may also consider watching Rich Balswick videos that he has posted on arm whip
http://balswickfastpitch.com/videos/
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