you got badass endurance, I die running
I can bike for hours "ok" not going maximum, but I can't run for shit (maybe cuz my right knee is horrid?)
I can do pushups forever now, doing pullups works your triceps like insane, you'd probably do them better than pullups if you have lesser bicep.. but chipups also use a lot of back muscle
I'm 165 5'10
pullup your palms face away, you're using your LATS and triceps mostly, and bicep gets in there too.. pretty much ALL arm muscles & a lot of back muscle and a little bit of your chest (pec) muscle, I keep my legs straight out in front of me so I'm an L shape so it also works my abs quite a bit.
chinup your palms face toward you.. this is pretty much all bicep as you can probably tell because that's the same way you do dumbell curls
muscle ups are just doing a whatever, and then going over it:
http://www.youtube.com/watch?v=YI75pYZl-vA
I do a pullup and then go over it, that imo is harder than rings.. though I grewup on rings so probably have those muscles developed well compared to whatever I'm using to do the chinup + going over to a full muscle up
imo the having arms with palms facing toward your body, while on your sides (similar to how his are in the rings) vs pointing away from you, is much harder because less bicep involved