SPEAKER_04 52:02–54:12
So he's trying to drive force down into the ground. Because his orientation is going to pull him away from the medial foot contact. So what he's got to do is he's got to translate some measure of mass over the inside edge of the foot to drive internal rotation into the ground so he can translate himself forward in the swing, right? OK. So this is a strength. You know where he's doing it. He's probably doing it at L5S1. Most likely is that where he's sort of driving that because of the knee orientation. So chances are you're getting in. So he's trying to get the sacrum instead of facing away from the pitcher, he's got to get a sacrum that faces towards the pitcher so we can move in that direction. And so you're seeing the knee move immediately, but chances are, if you can get a view of him from behind as he is swinging the bat, I would be looking like right at L5S1 if I were you and see what you're seeing there because chances are that's where you're gonna see this orientation where he's gonna be driving the, he's gonna be driving anti-orientation of the right side of the pelvis forward and left and down medial. So it's gonna try to be the internal rotation moment, if you will. So the IR, is not coming from the hip, obviously. It is going to be coming from the L5S1. So it's the pelvic orientation. Therefore, the knee is just following what the pelvis is doing. I would also make sure that you've got a foot that can capture the middle propulsive representation. Because if he can't do that, then you have an interference. And that might be, again, be why he's using this strategy because it does move his center of mass medial to the right foot and allows him to create that downward force.
biomechanicspelvic orientationL5S1 mechanicsfoot mechanicsforce production