Originally Posted by Back foot slider:
you can manipulate the knee whereas if you are rotating your "back" hip just prior to FFS then you will have to roll over the knee....which in my mind if done correctly makes the back knee action a result of hip activation, and a "non-teach".
Lord knows I'm no expert, but here's what I think...
You can try to turn your knee, but that makes things worse/slower.
You can use your back hip to turn the knee, but that's too slow. And the hip doesn't fully turn in time anyway.
In pitching and hitting, you extend (or triple extend, or whatever others call it) your back leg, which turns the knee, which turns the heel, and the rotating back leg turns the hip.