im 23 yrs old, chiropractic student (which helps a lot--but thats a discussion for another day), i'm 5'11, 190 pounds...i dont measure myself in terms of inches or whatever..my bodyfat is somewhere between 6-8 % depending on how i measure it..with skin calipers i'm 6%..but i was at a friends house the other day and he has one of those electro magnetic things you stand on and it said 8.9%..so i dont know..
Actually I know one measurement..my waist..its 28 inches around..(at least I know I wear a 30 in jeans and i have about two inches of extra space around my waist in them)
my arms are not that big at all..maybe 16 inches..but i'm not all about big bi's or whatever...just over all symmetry and leanness along with some mass..