The traps need focused retraction and depression work to prevent imbalances. For this exercise, start in the regular seated row position while making sure the back is arched and the chest pushed up.
From here, squeeze the shoulder blades together and hold for several seconds. By focusing on pushing the chest up and out, the shoulder blades are more easily depressed.
You finished boozing it up over the holiday? Good. Cuz it's time to put what's left of your brain matter to use in understanding the nervous system and how utilizing it can make you stronger and better lookin'.