Set players up as shown in video clip.
When the coach says 'GO' both players will start.
Offence only gets 1 shot.
Players switch roles after they finish.
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.