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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.
I always start my leg days with hamstring curls for a few reasons. First, leg curls are incredibly underrated as a hamstring developer. Starting your workout with leg curls allows you to place considerable emphasis on the hamstrings, as opposed to just tossing in a few meaningless sets at the end of your leg workout. Second, most lifters are extremely quad-dominant.