Originally Posted by dominikk1985
to me that is the same, fed is just using a little more forward and less up motion because it is a flatter shot. I know some people are trying to construct some magical moves (like the racket face closing because the ball is hit below center or some sudden direction changes) but IMO that is not really happening.
I think there are really only 3 factors that are combined in different doses:
there are no secret forces it just a combination of some well known biomechanical principles. There is a lot of "bro science" out there (even among good coaches and players).
Maybe different ways of explaining it work a lot better for different people, then. The way Will explains it, it's a windshield wiper motion that turns at the elbow.
The technique I'm talking about is brushing up and across the ball, leading with the side of the racket and pulling inward and to the left.