*nod* I was 290 at my heaviest and while it was not good for me (my knees hurt so much less now) I was always very strong.
I did once bend the frame on a futon, though. Ahem.
I'm sure it was metal fatigue.
(I'm 5'8", so the scale was about the same--but with climbing, weight *does* count.)
When you're ready to start, I will give you a piece of advice my 5'1" 120 lb climbing partner did not know to give me: start on the slab wall, which is... basically a very steep slope. MUCH easier for us big folks than an overhung or even vertical wall.