This is just a modified scoring game.
Both teams play out normally as if in a real game with serving and serve receives.
Scoring rules change.
Use the chart on the right or some modified version.
Game to 15, 21, 25, or 35.
Variation - drill could end after one team achieves a certain number of the conditions, example 5 FBSO / FSSO, 5 Runs of 3, etc.
Condition team to place greater emphasis on certain game situations.
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.