2 players stand on either side of the net, and the receiver starts with the ball by overhand passing it across the net. This player then passes to their team mate who overhand passes it back for the spike.
The spiker places the ball crosscourt. On the other side, the receiver's role is to step back from the net to the attack like and try and dig the ball back across the net.
Player performing net to attack line transition learns how to do it the quickest and adjust legs and arms movement to be ready to defend.
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.