The aim is for the team to pass to position 3 (midfield).
Place a mat at this position.
One person stands on the mat to catch balls.
Team line-up on one side of the field.
Rest + trainer on other side.
Team members of trainer serve ball, pass correctly (person on mat must be able to set up ball with both feet on mat) = point for passer. Pass wrong is change of person who passes wrong with server.
After a few minutes/balls rotate positions.
If necessary, trainer throws really balls in the field. Possible to extend game with set-up and play over net.