WITHOUT A BALL - Stand with your hips/shoulders/feet slightly more closed toward home, then fully open (toward third) to the target line. Do NOT stand completely open (shoulders inline with the target line) for this excercise. And do NOT stand more then 45 degree closed (toward the target line EVER).
Rest your throwing arm comfortably (not "stiff") at your side, and your palm facing inward, against the thigh.
Reverse Chaining/Motor Learning:
excellent post! i read it over and over and now am starting to do this!
can you tell me if these same mechanics should be used with the changeup, and also movement pitches? also, how soon should the lower and upper body open up fully? before noon? it also seems like ueno is closing her body before and during the ball passing by her hip. is that good?