The scrum is used to restart play if the ball has been knocked on or gone forwards in some way if the ball fails to come out of a ruck or maul and also for an accidental offside. The following practice drills build up the scrum starting the the front row only and adding players until all eight are involved.
This drill focuses on the second row in the scrum. Its purpose is to help teach the second row how to bind, push, and what position they should be in when engaged in the push. The second rows job is to bind together and place the head in between the prop and the hooker.