The Bryan Brothers Volley Practice

Great video of the Bryans a few years ago practicing before a match. Watch the volleyer and how his wrist pushes the racket out in front to meet the ball and then sometimes the racket just blocks the ball and sometimes it swings out a little more. The baseline player keeps the ball so low and again sometimes the stroke is just a block and sometimes there is more follow through.

Notice how they started down the middle and then went on the two diagonals- a great practice for any level of players to do- but maybe not quite as good as the Bryans.