This is to improve players medium to long range throwing and catching. Rules are that the players making a mistake get the a letter from the word OUT.
3 mistakes means that the player is out.
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.