Half the group at one end and the other half at the other end.
Taking it in turns players serve the ball and use their serving momentum to follow the ball, run and collect your ball.
Repeat from the other end.
The coach sets a target of how many serves the team are going to make without making a mistake, he also keeps count of good serves.
If an error occurs then the team go back to zero and start again. A reasonable score is 50.
World Rugby has reportedly conceded Aaron Smith's disallowed try in the World Cup final should have stood.
"It is not only useful for staff who are experienced but a valuable tool for those subject staff who have to take teams."
The variety of sessions across sports - sometimes we steal session ideas from one sport and use them with another.