Make this be the "Summer of the Pull-up." You can get there. Pull-ups are a great exercise to shape your back into that sexy machine you want it to be. Set a goal to be able to do one, and by the time you get there, it may also be time to buy more backless dresses. Remember in eighth grade when they made the girls do a bar hang instead of a pull-up? Do that! See how long you can hang there with a reverse grip on the bar. Next, see if you can pull yourself up an inch or two. Once that is easy, try doing little pulses for sets of 10 or 20. After a couple months, those little pulses will start to get bigger until you're cranking out pull-ups.