This exercise is fun to do and gives a lot of fun and competition! Relays in general already create competition.
What this exercise also wants to imitate is the stress factor that a service brings.
The players are divided into equal teams and lined up on the serving area of the same court. The first player of a team serves and retrieves his ball. After the next player is tapped, this one serves, and so on.
It is important for a player to serve quickly, but it must also be flawless, otherwise the ball must be retrieved and served again! Group for the first time must reach a multiple of the number of players in the group.
If the teams are small, it is fun to have everyone serve two or three times.