Well, it is one of the big Kinematic keys to speed. The separation (hips transition ahead of the shoulders)causes a diagonal stretch of the muscles from the non-throwing hip up to the throwing pectoral area. When those muscles contract (reflex) it causes the shoulder rotation to accelerate and additionally the stretch reflex of the pec accelerates the speed of internal rotation of the humerus. All good things for speed.Lets talk about separation between the hips and shoulders and pitching.
Would you mind sharing some video? I'm only a 1 cent bucket-dadI’m only a bucket dad but here’s 2cts. Maximum hip shoulder separation is 90degrees. That is hips closed to pitcher 90 degree and back shoulder straight back 180 degrees to pitcher. Anything less is not maximum anything more is bad form. The more I read on dfp and other places the more I hear shoulder should stay open ex. Lock it in drill discussion shoulder stays back let arm whip through with IR. Or Phill with fastpitch power and open shoulder sliding door motion not close door motion.
The only way my DD can maintain consistent speed and accuracy is through the maximum hip shoulder separation with IR delivery. The only way she can reach maximum hip shoulder separation is to drive forward over her drive leg while trying to keep her lower half that’s hips closed knee and foot pointed at catcher while letting upper body rotate until back shoulder and arm is 180 degrees palm up. Then stride foot should be planted fsr applied maintain good posture no bending forward at hips, elbows adduction to BI as IR of forearm whip of wrist and release. Nothing to it. Someone please tell me if Im coaching it wrong.
PS her hips do open to about 45 at full stride but then close immediately at stride foot plant.
this is all I can find now not a full separation of 90 shows hip trying to drive closed As shoulder rotates back.
Oops meant daughters are closing faster - nice catchMy thoughts on this are different. I believe there is very little 'stretch and fire' in the softball pitching motion. Creating torque between the shoulders and hips and 'firing' or closing at release are hallmarks of HE. The nature of the fastpitch arm motion requires that the shoulders stay relatively open to allow IR to take place. Ueno is definitely more open than the pitcher in the video.