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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 primary muscles used in your bench press workouts are the pectorals (chest) and triceps (back of the upper arm). Bench presses and similar lifts, such as incline or decline presses, call on the pectorals and triceps to work in unison, driving the weight upward from your chest. Because the pectorals are stronger and call on the triceps during presses, itâs important to work the press lifts first and isolate the arms after.