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What Are the Muscles of Your Arms? There are four main muscles of your arms: biceps, triceps, forearm flexors, and forearm extensors. There are also a handful of other muscles that support these main four.
Anterior arm muscles The body’s anterior muscles tend to be the flexors — they pull your extremities inward, toward your center. So the biceps of the upper arms flex (bend) the elbow, and the forearm flexors on the inside of your forearms flex the wrist and fingers.