Begin by having F toss to D
D passes to target (shown by cone).
F moves to pass, D moves to Target, Target moves to F, in continuous movement/motion.
Transition to tossing across net.
Transition to rollin over net.
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.