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The biceps curl is a fundamental exercise targeting the biceps muscles, the muscles on the front of your upper arm. No other muscles are directly involved in a biceps curl, although several muscles assist during the movement.our biceps muscle contracts both concentrically and eccentrically during the biceps curl. When you curl the weight up, the biceps muscle creates enough force to overcome the external resistance. During this phase of concentric contraction, the muscle fibers shorten, pulling at the elbow joint and lifting your forearm.
Target and Assister Muscles. Your biceps are comprised of two muscles that extend from your scapula to your forearm and run along the front of your upper arm. They are responsible for arm flexion; that is, when you bend your elbow to bring your hand to your shoulder during a dumbbell curl. variation on the supinated curl is the preacher curl. In this exercise, your upper arm is supported by an angled bench. This keeps the upper body stabilized to hone in on the biceps. Rest your upper arm on the back of a workout bench that is set to an angle. The top of the bench should hit your arm pit.