I've heard from various sources that Federer's footwork is very good, and may be the best currently on the tour. Why? What is it about his footwork that makes it so good? I ask because while watching the Tennis Masters: Facing Federer show I saw Federer returning some balls in slow motion, and though he did look fluid (as do the vast majority of pro players) all I saw was a split step, a step or two left or right, then stepping into the ball to hit. This is no different from other players. So what makes his that much better? On a related note, does anyone know his strength/conditioning/agility regime? Any special footwork drills or anything?