Players walk around the court stepping on the lines, so walking towards the net, then across the net, then back again.
While doing this, they are overhand passing the ball in the air.
Ensure players do this drill at a good pace, and also ensure it is done correctly. If a player takes a step outside of the line, tell them to start over, as this will help improve their coordination.
If players perform this drill well, make it harder for them by having players close one eye while walking to improve hand-eye coordination.
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.