In pairs, the players stand facing each other with one ball.
Player 1 throws the ball using an underhand pass, over player 2's head who then sets it back.
The player should be looking to set the ball back to their partner accurately and powerfully each time.
Good footwork is needed if a throw is inaccurate.
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.