Player stands on attack line facing the net with right foot in front if right-handed, and left foot in front if left-handed. They toss the ball high, move their other foot forward, setting up serve position.
Have the player start by serving the ball with a high trajectory and then lower it as the drill goes on.
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.