This video shows how to isolate and work out the biceps using resistance bands. You engage a very wide variety of muscles beyond just biceps and resistance bands work "phenomenally well" to engage your entire arms, forearms and shoulders.
It also gives you a great workout and you can get a great workout very quickly. And if you are a woman and want to tone up, just lower the weight and raise the reps. Using the lighter bands in addition to cardio will help you burn fat and tone up. Basically with resistance bands you can very effectively build muscle or lose weight and adjust depending on your goal. Bodylastics is by far the best resistance product on the market right now btw- they have a high manufacturing cost, high quality product that is sold at a very reasonable price.