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What are the pec muscles?

When people talk about their pecs, they are talking about the pectoralis major muscles that make up most of the chest in men and lie underneath the breasts in females.

The pectoralis major muscle is mainly responsible for rotating your arm in, bringing your arm across your chest, and raising your arm. (This answer provided for NATA by the University of Montana Athletic Training Education Program.)

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.