Players line up in pairs facing each other with about 5 metres between them.
The attacking player dribbles towards the defending player. As they approach the defender they should make the move to throw the ball.
It is the defender's job to push the ball away as the attacker goes to throw, using the hand that is closest to the ball.
The rules of the game state that players are allowed to make contact with your opponent when defending.
To begin with the attacker should only mimic throwing the ball, making it relatively easy for the defender to intercept the ball.
As the drill progresses though you can instruct the attacking players to increase their intensity and speed, building up to a full speed attempt to throw the ball past the defender.
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.