Muscle: Latissimus Dorsi
Step 1: Sitting on a bench, grab a bar with a false overhand thumb on the same side as your fingers shoulder-width grip.
Step 2: As you pull your shoulder blades together and down, while sticking your Chest Out, pull the bar to your chest. Then, pause with the bar an inch or so from your chest, and slowly let it rise to where it began. Throughout, keep your chest out.