Set up four cones in a square in one half of the court, with a player and a ball on each. The remainder of your players should line up a couple of meters behind the back line.
On the coach's whistle players take it in turns to run out each cone in turn where they play a pass and return before running to the next station to play another pass and return.
Players should be running quickly to each station, stopping in front of each station with their hands in a ready position to make the set.
New hitters rarely miss because of their arm. They miss because of their feet. Build a reliable approach, then time it with your setter.
When your hitter gets stuffed, five teammates standing and watching is how you lose the point. Good attack coverage turns a blocked ball into a second swing.
Coaches spend hours correcting arms in serve receive when the real fault is almost always the feet. Fix the movement and the platform fixes itself.