A game of 4v4, in either the basic or advanced style. After each crossing of the net by the ball, players rotate one place around a position on court, increasing the mental concentration needed by the players to adapt to the different roles on court in each position
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.