Pull up and Chins
I love Back day, its my favorite. So of course pull ups is my bread and butta. I can do about 18-20 wide pull-ups with the hold of 1001 and 1 at the top and a slight pause at the bottom of 1 and up again. (168-170lbs)
After that first set it hurts like hell and the reps start really dropping off. But I do forced ones as well and that will widen the back.
Chins....well....I would think that they are easier than pull-ups....so I am banking that I could alot more. But the truth is that I don't even do them at all...if they are worth it I will start..., all I need is the usual sign of all those in favor.