This is a simple but effective back workout you can do quickly and regularly. This 17 minute circuit consists of 3 exercises: standing rows, pullovers, single arm reverse flies. You will need 1 heavy dumbbell for the pullover, a pair of medium-heavy dumbbells for the rows, and 1 light dumbbell for the reverse fly. I'm using a bench. You can use an ottoman or edge of your couch or you can just lay on the floor if you don' have anything else.