This is fairly simple group ball-handling and movement drill (though with room for increased complexity and/or intensity) that could be used as a warn-up.
This is a combination volleyball passing and setting drill, which can also incorporate controlled serving and/or hitting.
After catching a break on the scheduling front, I was able to run a fairly comprehensive training session with a particular emphasis on reading and movement.
You can use the virus volleyball game to work out-of-system play on one hand and on recognition of it and proper defensive positioning for it on the other.
Here's a game I saw at UCLA which works on hitters challenging the block, with additional serve receive and free ball attacking
This is a volleyball game which focuses on serve receive and free ball offense while encouraging an aggressive mentality on both offense and defensive sides.