As a lock, strong legs and a strong back are used to “lock” the scrum in position and then propel it forward, if circumstances dictate that it is appropriate. Your front row will struggle if you fail to do so effectively.
Lock/2nd row (4 and 5) — In scrums, locks are behind the front row and thus provide most of the pushing power. In line-outs they usually catch the balls thrown in by the hooker. In line-outs they usually catch the balls thrown in by the hooker.
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The next rugby positions in the forwards are the locks. At professional rugby union level, a lock won’t usually get any change out of two metres in height. They are almost always the tallest rugby players on the field and their job is to be lifted at lineout time and kick off time to catch the ball.
Some have called the locking position the “engine room” as is one of the most demanding and physical rugby positions on the field. Locks tend to be some of the heaviest players on the field. This can be the case purposefully, or just as a function of their vast bone structures.
As a lock you change positions in the line-out so you can hide your intentions. Yes, acting ability is useful in rugby! Make the opposition think one thing then do something different. Often at the top of the jump the lock will catch the ball and use agility to throw it to the scrum-half without pausing.
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The locks are usually the tallest players and are required to jump in lineouts to catch the ball or get the ball down on their team's own side. In the scrum, locks pack down in the second row and bind on to each other and the prop in front of them. They add a lot of power to the scrum. 6.
Locks. Second Row’s (or “Locks”) are regarded as the work horses of Rugby Union. These guys have either number 4 or 5 on their jerseys but both numbers mean the same thing. Second Row’s do an insane amount of work as they hit rucks, mauls and usually are the top tacklers for their sides.
A normal rugby union team formation illustrating each of the positions and their respective numbers. In the game of rugby union, there are 15 players on each team, comprising eight forwards (wearing jerseys numbered 1–8) and seven backs (numbered 9–15). In addition, there may be up to eight replacement players "on the bench", numbered 16–23.