Players start by standing on one leg.
Keeping a balanced body position, they jump and change legs so they land on the other leg (so if jumping from the right leg they land on their left leg).
At the beginning this might be difficult to perform as players develop strength and balance.
Firstly, players need to stay balanced and stand on noticeably bent leg. Secondly, all jumps should be as high as possible.
This drill aims to improve jumping abilities, balance and strengthen quadriceps and knee joint.
To add progression you can ask players to jump and landing on the same foot 10 times in a row and then change the standing/jumping leg.
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.