Pull Down
The back muscles on the side are called Latissimus Dorsi or short your Lats, and they give the back its width. As the name suggests, this exercise mainly trains these muscles. There are lots of rowing exercises that train your lats, but the advantage of Pull Downs is that your lats are stretched out in the starting position. This is because the Lats muscle attaches to the arm bone and is stretched out completely when you lift your arms forward over your head. The path of movement for the muscle is thus long, which is good for muscle growth.
