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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.
Laree Draper of Davedraper.com points out that most gym exercises, including squats, flat pressing and pushups, work in the sagittal plane. Bicep curls, which start by holding the weight in the extension phase and curl the weight up to the point of flexing the bicep, is a sagittal-plane movement. It is important to include exercises from the other planes in your program to prevent injuries and sculpt a well-balanced body.