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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.
The weight of a dumbbell you select for an exercise varies according to the muscle groups. When doing bicep curls, you can use 5 to 8 pound weights, while the exercises for the weaker triceps muscles, such as the triceps kickbacks, are best performed with 2 to 5 pound weights.