Players work in pairs and stand across the court from each other. One player starts with the ball and overhand passes the ball high in the air and walks forward. They keep setting the ball until they have reached the other side of the court.
Once at this end, they set the ball to their teammate who does the same thing, while they walk across the court.
By walking, players must adjust their movement and be aware of the ball trajectory. It helps players to get a balanced position for the set.
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.