If you've been yearning for sculpted and toned arms, working out on the treadmill or elliptical machine isn't going to help you get the muscle tone you're looking for. The best exercises for shapely and attractive arms require you to challenge several key muscle groups in the upper and lower arms; you'll need to do exercises that target your biceps, triceps, shoulder muscles and upper back so that you can build strength and increase muscle size in each area. Here are some of the best exercises for getting your arms in great shape:

Bicep Curls

Bicep curls are one of the easiest exercises for the arms and can help you develop strength in the lower and upper arms. You can perform this exercise by standing with feet shoulder-width apart and holding two dumbbells (one in each hand) in front of you. Slowly lift the dumbbells to a 90-degree level and hold. Repeat the sequence for each rep, inhaling as you lift and exhaling slowly as you lower the dumbbells.

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Tricep Kickbacks

The triceps are one of the hardest muscle groups to work, but tricep kickbacks can keep these muscles in great shape and help you get that defined, sculpted look. To perform the tricep kickback exercise, you'll need to lift a dumbbell "backwards" (the opposite of a bicep curl) by pulling it back behind you.