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Specifically, the biceps curl works the muscles in the front of the upper arm. Nicole L. Campbell: To do a biceps curl with a dumbbell, hold a dumbbell with your palm facing upward. Slowly curl the weight up by bending your elbow, keeping your elbow close to your body. Then slowly lower the weight to the starting position. You'll feel tension in the muscles in the front of your upper arm. When you're doing biceps curls, don't swing your arm or elbow.
For example, when you perform bicep curls, the kinetic chain of this exercise is about the muscles and nerves of your arm and shoulder working together to achieve elbow flexion, and not just about your biceps muscle, which is often your primary focus with this exercise.