Originally Posted by rkelley
You can do this, and you can hit a nice flattish stroke, but you can't get the big topspin without some combination of forearm pronation and upper arm rotation. The racquet has to go up, and given human physiology that's the best way to do that.
With the E. grip specifically, it's going to be mostly pronation at the contact point. Upper arm rotation mostly decelerates the racquet. With more W grips it's different.
Actually, what I described in my post above is exactly how the racket contacts the ball and produces topspin as far as it is concerned. To produce a topspin shot the racket face just needs to contact the ball unevenly, above its equator, and with an upward and forward path. IMO, for simplicity's sake that's all novice and overworried players need to focus on. (Of course, after contact, simply allow the racket, your arm flow their natural courses.)
For me that has been much easier to learn than to pay attention to "forearm pronation" or "upper arm rotation", etc.