How to exercise the back muscles

I would like to exercise a back muscle near the shoulder blade. I am relatively thin physique, to exercise the thick of some, push-ups so I am now out of a training point of chest, but a little meat back or not, let us help you direct me.

You can do chin-up, preferably the head forward, which is so neck through the bars, you can also choose to inverted, but also exercises arm muscles can also exercise the back shoulder blade nearby muscles, you can try ah, the next day you can clearly feel the muscle soreness that