The pull-up has always been one of my favorite exercises. I mastered the form and I'm working my way to 20 in a row. I'm at 14 for the month and I do them twice a day, in the early AM and at night. It's all about not doing the Cross-Fit kipping and swinging. I dead-hang and it's hard but my wife tells me how she appreciates my rather nice lats.
The row is another exercise I like, and I pull my elbows together behind my back when I move the weight. It's good for biceps, too.
I am also currently working my way up to proper pull-ups, so at the moment my absolute favorite for the upper back are Australian pull-ups. I do them every day, and my sets are getting better and better.
Now, a day after my first Strong Viking - Beast I will say I enjoyed rope climbing, tyre flipping and heavy carries a LOT! At some point I even took a second sandbag to go the hill up and down, since my buddy was in pain and struggling to finish. All things I never did before.