I thought some of you guys might have some insight on this. I have a "Perfect Pull-up" bar installed in a doorway in my house, and I have noticed that when I do pullups with a perpendicular grip (on the bars extending towards your body), I can regularly crank out several more than either under-handed or over-handed pullups. I can't really tell what's being targeted differently when I do them this way, though. Deltoids, maybe? The relative ease would make sense as I've always had disproportionately strong shoulders for some reason. Thanks in advance.
(waiting for a four paragraph long scientific explanation from Slash McCoy)
(waiting for a four paragraph long scientific explanation from Slash McCoy)