Teams of 4 one ball the team that throws the ball over the net has to rotate as soon as the ball has gone over. The other team has to catch the ball and throw it back over and rotate in turn.
Point scored when the ball is dropped.
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.