The batter is out if the fielder touches the post immediately ahead with the ball or the hand holding the ball while the batter is running to the post and before the batter has touched the post, except first post in case of a no-ball.
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.