A setter faces the net, while three other players stand facing them with a ball each. These are given numbers and are lined up on the attack line. One of the three calls out their number and passes the ball to the player at the net, who must quickly turn around and set the ball back.
The task of a setter is to recognise the called number to turn around and face the correct player, judge the ball and set it back accurately.
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.