Place one player on one side of the net and another on the other side, on the 10-foot line.
One player will toss the ball over to the other player on the other side of the net.
That player will attempt to pass, set, and spike in a controlled manner to the player across the net.
This is a miniature game staying in the vicinity of the 10-foot line.
You can add more teams along the net, up to three to four, so they each have enough room.
This is a great training tool for working on the fundamentals, ball control and hand eye coordination.