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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.
Your biceps are the strongest of all arm muscles and make a great curve just above the elbow. Make sure to perform bicep curls with three hand positions: palms up, palms down, and thumbs to the side. Perform 12 repetitions to the front and then 12 repetitions of each to the side.