The first player moves forwards, makes contact with the tackle bag and retreats diagonally to the line of cones.
The next player joins the line and both the players move forward and hit the tackle bag or shield before retreating back to the line again.
The third player then joins the line and all three players go out to meet the tackle bag, shield or fall on the ball.
Drill continues with all players involved.
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.