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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.
Reverse biceps curls require your elbows to flex, or bend, against the pull of resistance to primarily develop your brachioradialis muscle, with assistance being offered up by the biceps brachii and brachialis muscle. This collection of muscles is located at the front of your upper arms and elbow.hen part of a single workout, the reverse curl and French curl target all of the major muscle groups in the arms. They can be used to build strength in the brachioradialis, biceps brachii, brachialis and triceps brachii muscle if you perform them at a volume of three to five sets of six or fewer repetitions.