What is the Pec Muscle and Why was It Injured During CrossFit Regionals?

WHAT DOES THE PEC MUSCLE DO? The pectoralis major, or pec major, muscle attaches to your sternum and collar bone on your chest and connects to a grove on your upper arm. It is responsible for four primary motions: Horizontal Adduction: bringing your arm across your chest Internal rotation: rotating your shoulder inward toward your…

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