One player passes an inaccurate long pass behind teammate whose task is to move back and set up balanced position prior to setting the ball back.
Being made to change position helps to move faster and be more consistent in establishing balanced position during a match. Players rarely receive a simple ball so they need to be aware of a need of proper position.
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.