I recently posted the following about volleys.
It involves a comparison between the forehand and backhand volley.
Perhaps you will find this helpful.
"When you watch the pros, the rhythmic quality of their volleys is apparent:
Roger Federer Slow Motion volleys
http://www.youtube.com/watch?v=Qju-1MOj9cg&feature=related
Andy Murray - Volleys in Slow Motion
http://www.youtube.com/watch?v=f7YJxNvH_mI&feature=relmfu
It's not a full swing, but it's not just a punch either.
The key seems to be the early shoulder turn, transferring the weight onto the back foot so the step into the ball can occur.
But the racquet is never just pushed in the direction of ball flight. The racquet is kept in continuous motion back to the center.
The follow through on the volley is essential for recovery of body balance to be ready for the next shot.
As the ball approaches, turn your shoulders (turning your entire upper torso) away from the ball, and power volleys above the net by stepping into the ball.
In the sequence above, Serena rotates only 45 degrees away from the ball, then rotates back only to neutral as she directs her racquet straight forward in her stroke.
Note the shoulder turn precedes the step, with the step into the ball indeed essential as you yourself mentioned above.
Note the racquet travels pretty far; it's not just a punch, but a shortened stroke bringing the racquet around back to the center in the follow through (rather than just leaving the racquet pushed straight in the direction of the ball path.)
That continued movement of the racquet in the follow through is essential for a quick rebalancing of your body in recovery for the next volley.
Same thing on the backhand volley. The early shoulder turn precedes a step, with a follow through bringing the racquet back to the center of the body to aid in recovery of balance for the next shot:
This sweeping motion of the arm into the follow through is even more pronounced on the low volley. Sweeping the arm through and up on the follow through is essential to pull our upper body up out of the low vollwy position to recover for the next shot.
Tennis instruction from Tennis Oxygen: The Volley swing path
http://www.youtube.com/watch?v=uQMLW2Szcb0
Tip #2: Almost point the butt of the racquet at the ball.
On groundstokes we are taught to "aim the butt of the racquet at the ball".
It's more subtle in the volley, but we should start to point the butt of the racquet at the ball (lay the racquet back) in the initiation of the forward swing. See pic 4 of Serena above and pic 3 of Djokovic.
Tennis instruction volley secret #1 by tennisoxygen.com The need to lay the wrist back when hitting a forehand volley.
http://www.youtube.com/watch?v=t9RAtTP5SYg
Tip #3 The footwork on the volley follows from the early shoulder turn.
If you are split stepping each time your opponent hits the ball, and your first reaction is an early shoulder turn away from the ball for the appropriate forehand or backhand volley, the proper footwork should follow.
Square quickly to be ready for the next split step/volley.
If you think you have gotten in too close to the net, step back and split step.
If you are on the way to the net, take another step or two in, but be spit stepping as your opponent strikes the ball.
Always move in at a diagonal, never straight across for volleys to your side.
It's often been said "You volley with your feet".
Good volley practice should involve nonstop motion, rebalancing and split stepping.
Bryan Brothers Warmup Volleys Part 1
http://www.youtube.com/watch?v=Z0ER3qLf91I&feature=relmfu "
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