Lead femur should move only half a hip width through impact
The speaker says the proper amount the body moves is over the top of the lead foot as you rotate through the ball, which he calls about half a hip width over. He checks that his players move roughly half a hip width from the top of the swing, drawing a line to see it, and says this happens naturally and should not be actively worked on.
Channel: PorzakGolf
Watch official source at 8:10