AFAA Personal Trainer Certification Practice Exam

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What is the main function of the teres major muscle?

Extends the forearm
Medially rotates and adducts the arm
Stabilizes the shoulder joint
Elevates the shoulder girdle

The correct answer is: Medially rotates and adducts the arm

The teres major muscle plays a crucial role in upper body movement, primarily by medially rotating and adducting the arm. This means that when the teres major contracts, it pulls the arm closer to the body (adduction) and rotates it towards the midline (medial rotation). These actions are vital for various activities, such as reaching across the body or performing certain lifts. Understanding the teres major's function is important for personal trainers, as it helps in designing balanced workout programs that strengthen the muscles around the shoulder joint and improve overall upper body function. Additionally, strengthening this muscle can help in stabilizing shoulder movements, enhancing performance in many athletic and daily activities that involve the arms.