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 mimic is the stress factor that a serve 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!
If the teams are small, it is fun to have everyone serve two or three times.