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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.
This means that bicep curls work all areas of the bicep muscle. Also known as straight bar curls, they extend to working the shoulders and triceps, as well. This exercise is also known as dumbbell curls, kettlebell curls or barbell curls, if you are using the appropriate weights. 1  Main Muscle Used: Biceps. 2  Secondary Muscles: Shoulders, Triceps. 3  Equipment Required: Dumbbell, Kettlebell or Barbell.  Movement: 1  Isolated. Exercise Type: Pull.