Just from watching the pros hit forehands, it looks to me that Federer And Co. don't actually ****/lay their wrists back consciously, but rather, they relax their wrists on the swing, which creates a "lag" with the racquet (in other words, the racquet lags behind the wrist), which "cocks" the wrist back. Kinda like what you see when the pros serve - the racquet drops behind them, not because they're consciously doing it, but because as they propel themselves up to the ball, they relax their shoulder muscles, allowing the racquet to "drop". But I think the racquet only "drops" in relation to their bodies, not in relation to the ground. At least, that's the way I see it. Can any of the better/more advanced players on the board confirm/dispute this for me?
Haha! The word c-o-c-k is edited, but not when I put an "s" at the end. Weird.