Originally Posted by sureshs
Across, up, and extension happen together as the arc is 3D. You cannot artificially separate them.
that's what I was saying. there is no "across" in a Tennis shot. it is just a natural continuation of the arc around the Body. of course you could actually fight against the arc by extending. and you could also cut the off by actively pulling the arm in (active pull across).
but to me it Looks like neither is Happening- there is just one arc around the Body.