Biomechanics of the upper limb: flexion and extension of the arm

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Everything you learned about the biceps in anatomy class is only half the story. 💪 Traditional anatomy teaches you where a muscle is. Functional anatomy teaches you what it actually does when your body is moving in the real world — and those two things aren't always the same. Classic textbooks describe the biceps brachii simply: it flexes the elbow and supinates the forearm. But fix the hand in place — like when you're climbing, pushing, or holding onto something — and that same muscle complete