Players stand opposite each other with a mat in between them.
One player starts with the ball and throws it up in front of them, before diving forward and digging the ball to their teammate. They should throw the ball so that their dive lands safely on the mate.
This drill improves co-ordination, and allows players to progress at a speed that they are comfortable with.
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.