I'm a climber, and although my breasts don't hinder me on the wall, they can get in the way of the view when I'm trying to find the rope! It also feels a bit weird because most female climbers are very athletic in build. I am not! I have a small waist and large breasts, so the harness really accentuates my chest and makes me feel a bit exposed. I used to feel self conscious about this because blokes sometimes do stare. But climbers in general are a liberal, non-sexist crew, so at least they don't make an issue of it.