An offense in which a player who, while running for the ball, charges the opposition in any way other than with their shoulders; any player who is in an offside position and deliberately blocks the player from their own team who is in possession of the ball; any player who, while carrying the ball after a set piece of play, tries to force their way through the players of their own team in front; and any outside player of a ruck or scrummage who attempts to block an opposing player from moving around the ruck or scrum.