Keep eyes on the ball, and other arm used as a guide. Player leans slightly back prior to contact with the ball. Upon contact, push body weight forward to generate power through the shot. Stay tall on balls of feet and keep knees bent.
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.