This drill can be performed in pairs, or players can perform it individually against a wall.
Players set the ball either to their partner or against the wall, and alternates between setting while standing on their feet, and setting with a jump.
Ask your players jump to jump as high as possible so that they are setting the ball using mainly their arm muscles.
If players struggle to alternate at first between standing position and jump setting, start them off with just overhand passing in standing position, and then introduce jump setting gradually.
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.