I've heard others dispel the myth of being muscle bound, but I'm not so sure I agree. I think there is truth to it.
I am quite flexible (I can put my knuckles on the floor with straight legs when I am stretching my hamstrings for example), but I can't touch my elbows to each other in front me, I believe that is due to my pecs getting in the way. Recently I realized I can't touch my left hands fingers to my left shoulder, or vice versa on the right side (much like a time out signal) I believe this is mostly due to my biceps getting in the way.
Am I saying that I am muscle bound? To a degree, yes.
Anyone here in the same boat as me?