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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 biceps are a grouping of muscle fibers that expand and contract one way. When you do a bicep curl, the muscles are lengthened under tension.There are thee phases to â¦ the curl. The first phase is a slow lowering (eccentric-lengthening) of the weight down to a parallel positioning with the ground.This should be a controlled 3-5 second movement. It should burn but not injure. The Proper Way to do a Bicep Curl Bicep curls are one of the first exercises taken on by individuals interested in weight training.