Step Into The Backhand

I've been looking at some videos of players hitting two-handed backhands. One thing I've noticed is that there is a stepping motion. Typically, the player is on the back foot, and just a fraction before, they step to the front foot and swing. The hips then turn and the back foot is on its tip.

There are two videos with Agassi (at least). The one above is an unusual angle, which is why I picked it.

I gotta say, this YouTube thing is wonderful to find stuff just like this.