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How to play hooker in rugby
Start with the scrum.
In the scrum the hooker is the middle of the front row. Usually if it is your teams ball, you will be able to signal, via your hand which should be visible to your scrum half, when the ball goes in, this way, you have the element of surprise.
Now that the ball rolls in, you want to sweep it back. The ball always (should) comes in from your left.