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The clavicle, commonly known as the collarbone, is a small but essential bone that connects the upper limb to the central skeleton. It plays a crucial role in shoulder stability, arm movement, posture, and protection of important nerves and blood vessels. Despite its relatively slender shape, this bone withstands considerable forces during everyday activities, exercise, and sports.

Muscular endurance is the ability of a muscle or muscle group to repeatedly contract or maintain tension over time without becoming excessively fatigued. It plays an important role in fitness, sports, work capacity, posture, and everyday activities such as climbing stairs, carrying groceries, hiking, or maintaining good form during exercise.