In rugby, few phases of play are as iconic as the scrum, yet the role of the locks is often overlooked. Positioned in the second row, the locks are central to the scrum’s strength, stability, and coordination. They bind tightly behind the front row, driving power forward while helping maintain the structure of the pack under pressure. More than just physical force, their job also demands timing, technique, and close teamwork with the other forwards. Understanding what the locks do in a scrum offers a clearer view of how this set piece works and why these players are so important to a team’s performance.