In my motion capture studio, each foot stands on its own plate. The plates measure force in three directions, plus the twisting force, 1,000 times a second. My motion capture system records them in sync with the movement the body and the club. So every push can be tied to a position: top of the backswing, transition, impact.
The swing below is a 7-iron from a female champion junior. Each foot's force is shown in its own color: orange for the trail (right) foot, blue for the lead (left) foot.
