I use Jordan Spieth and Charl Schwartzel as examples of players who are moderate in physical size but produce tremendous clubhead speed. In both cases we see the upper body begin to back up around P5, with the left leg beginning to push up off the ground and the pelvis elevating from P6 into and past impact. In our lesson before this we focused on foot pressure in transition, and stabilizing the right foot will help this downswing action occur.