In an attempt to keep 60% or more weight on the left side on the backswing, I have been restricting any motion in my left knee. Conventional theory says to allow the left knee to point behind the ball on the backswing. In reviewing the video lessons I do see that your left knee does move back in your backswing.
As long as the weight stays forward, do you agree that it is helpful to obtain a bigger turn and more distance by allowing the knee to point behind the ball? Despite stretching & yoga, I still have a short backswing do to stiffness, hip replacement ect.