There's so much you can do with just a single set of dumbbells. They're inexpensive, easy to use, and small enough to keep tucked under your bed. And while there are plenty of effective bodyweight exercises out there, adding a few pounds to your strength training workout is a simple way to increase the intensity and further challenge your muscles—which is what they need to keep getting stronger. This workout focuses on all of the arm muscles, and you can do it pretty much anywhere you want. ~ Berceste