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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.
The bicep curl is the simplest exercise to perform to increase bicep muscle and improve definition. It is a good idea to combine the bicep curl with tricep extensions to balance the muscle development.This is important because muscles work in pairs and the opposite muscle to the bicep is the tricep.he bicep curl is an isolation exercise which targets the bicep muscle in the front of the upper arm. The exercise also works the brachialis, which is a muscle situated beneath the bicep, assisting it at the elbow joint.