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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.
In order to build big biceps, youâre going to have to do curls. And thankfully, there are a lot of variations of this particular exercise: concentration curls, Olympic barbell curls, preacher curls, EZ bar curls, cable curls, hammer curls,â¦ But thereâs one exercise that gets overlooked quite often, and that is the âZottman curlâ.