Divide the main group into smaller groups of 4 and set up as shown. The ball is thrown to the fielders (person in the middle) right or left for them to dive onto the mats. The two players behind the mats are back-up fielders.
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.