loosehead

Loosehead is a rugby union position in the front row of the scrum, designated by the jersey number 1. The loosehead prop provides stability and power in scrums, while also contributing to open play through tackling, ball carrying, and ruck and maul engagements.

In the scrum, the loosehead is positioned on the left side of the front row and is named for the "loose" side of the scrum, as opposed to the tighthead prop on the right. The role emphasizes scrummaging technique, neck and shoulder strength, and the ability to drive with the legs, while requiring mobility to compete in open play.

Typical physical attributes include a large, strong frame and high work rate. Modern looseheads balance scrummaging power with fitness to cover the field, as teams expect them to contribute in defense and as supporting runners. They may also be involved in lifting in lineouts and providing support during rucks and mauls, depending on team strategy.

Notable players associated with the loosehead role include Mako Vunipola, Tendai Mtawarira, Tony Woodcock, Joe Marler, Cian Healy, and Alex Corbisiero. The position is primarily used in rugby union, with front-row roles in rugby league described differently.