Two players work with 1 ball.
The feeder rolls the ball to the keeper's side. The feed can be made to either side.
The keeper should react to the roll and dive in a controlled manner to their side, stretching out to catch the ball and then roll it back to the feeder, ready to start again.
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.