Volley the ball to your partner who volleys the ball to themselves one time whilst you do two block jumps this is then repeated by your partner.
Ensure players are jumping as high as they can - performing two large standing jumps.
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.