the three front row players

Rugby's concept of contesting for each possession whether after the tackle (ruck) or when the ball goes out of bounds (line-out) or on a minor infraction such as a knock-on (scrum) took me a while to get used to. The rules around these contests and particularly those dealing with the rucks and scrums can be quite detailed and not intuitive to those of us who did not grow up with rugby, but he more you watch the more it will make sense.