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Chest Muscles Defined:

The Pectorals cover the chest and have clavicular (upper) and sternal (lower) fibres. They draw the shoulders and arms forward and inward.

The Serratus anterior covers the side of the chest wall on the outside of the ribs. This muscle is used mainly for pushing and punching actions and is nicknamed 'The Boxers Muscle'.

The Intercostals lie between the ribs. Their main function is to draw the ribs closer together.