What is Rugby?

This article from Wikipedia discusses Rugby Union, of which the CSULB Rugby team plays.

Team positions: Lock

Locks are almost always the tallest players on the team and so are the primary targets at line-outs. At line-outs, locks must jump aggressively to catch the ball and get it to the scrum half or at least get the first touch so that the ball comes down on their own side.

The two locks stick their heads between the two props and the hooker in the scrums. They are also responsible for keeping the scrum square and the front row together and providing power to shift it forward. (This position is referred to as the "engine room".)

Locks are very tall, athletic and have an excellent standing jump along with good strength. They also make good ball carriers, bashing holes in the defence around the ruck and maul. They run a lot as well . They also have to push the rucks and mauls and are the main figures of a maul

Notable locks include Paul O'Connell (Ireland and Lions), John Eales (Australia), Daniel Vickerman (Australia), Colin Meads (New Zealand), Willie John McBride (Ireland and Lions), Malcolm O'Kelly (Ireland and Lions), Fabien Pelous (France), Donncha O'Callaghan (Ireland and Lions), Bakkies Botha (South Africa) Martin Johnson (England and Lions), Chris Jack (New Zealand) and Victor Matfield (South Africa).