Partners stand opposite each other and throw a ball back and forth, trying to see how many catches they can make in a given time (e.g. 1 minute).
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.