Quickness and Reaction Time
Stand in the middle of the court, have someone serve to you (or toss
the ball if they are not a volleyball player) from the other side of
the net. Move into position so that the ball bounces between your
legs. This works on quickness and moving your feet into position to
pass the ball between your knees. To work on serving as well, do this
drill with a partner and see how many in a row you can do.
Have someone toss you balls from the other side of the net. Work on
your reaction to the ball to be able to block. First, have them toss
from side to side working on your step/hop to block. Next, have them
toss balls close to the net and a little further off, work on rocker
steps back to hit a ball that is further off the net.
Lie down on your stomach behind the end line of the court. Have
someone stand as the net facing the end line with a volleyball, have
that person slap the ball and then toss or bounce it anywhere on the
court. As the person slaps the ball you must get up from your stomach
and run after the ball to make a pass before it hits the ground. You
can also try to pass to yourself, set to yourself, and hit the ball
across the net. This is a great conditioning drill as well.
Source: Volleyball Drills to Better Your Skills