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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.
While not worked as extensively as in a narrow-grip bench press, the triceps are used during a wide-grip bench press. The primary job of the three-headed triceps muscle is to extend the arm at the elbow. The long head of the triceps also helps stabilize the shoulder joint during the wide-grip bench press.