Originally Posted by toly
I donít like a vague tennis terminology. It seems that nobody is able to explain clearly what exactly we should do to extend through the ball. Our joints are very good with rotational movement, but very bad with straight linear motion. IMO, we just have to rotate relevant parts of the body in synchronized manner and forget about across or through aspects.
Agree with 5263, this is a good post, toly. And don't write off the picture sequence of Serena you posted above as being all flat and having no topspin. It is not evident from the picture, but her hand is pulling in, causing the racquet to whip into the ball, and it definitely has an upwards movement (can't anything tell about sidespin, though). That plus the forward tilt of the racquet will ensure there is a lot of topspin, probably much more than I can hit!
But the trajectory of the ball looks like it will be flat.
Thanks for posting this great pic.