legs
forearms biceps
your thy and arms
butt muscle
The whole of the skeletal frame is used in the game. The joints in arms legs and back are the most stressed.
serving i think
your legs because you have to jump high enough
mainly leg muscules....some arm
spike
For all these sports the muscles of the legs are needed.
The rally begins with a serving from the serving team.
If your foot is on the serving line