Muscles all around the body are used to power through somebodies thighs and smash them to the ground. The main muscles used are probably:
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Upper body. Pecs, lats, traps, biceps, triceps, deltiods. Lower body. Hams, quads, gastrocnemius. Rugby uses virtually every muscle.
the top back leg muscules are used in a scrum as well as your top arm muscules. and these are used again when takling and the top front muscules are used to sprint up and down the pitch.
basically ALL muscles are in use when you scrummage. The whole of the skeletal frame is employed in the push effort