I tried searching for a a thread about this to no avail, though I'm sure one exists as I've seen quad and others mention it. My understanding is that chins (supinated grip) activate the biceps more while pull ups (pronated grip usually wider grip) will activate the lats/rear delts more. My friend, a seasoned weight lifter, says the reason I'm not 'growing wings' or getting much of a V is because I do chins, not pull ups, and don't do my BB rows in the wide grip, trunk horizontal to the ground, but I guess have been doing something more like a yates row, body at 45 degrees, elbows in, weight pulled up to the navel. Any opinions? (I'm also a relative newbie, and my progress thus far has been some muscle gain with big time fat loss. this could also be why I'm not 'growing wings.' hyper caloric diet might change that).