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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.
You may want to train for hypertrophy in your biceps, triceps, and shoulders. You can do 4 sets of 10 repetitions for biceps, triceps, and shoulder exercises. If you only have dumbbells you can do dumbbell curls for your biceps. Make sure to use the appropriate weight and use proper form when lifting.