Comment by tomxor

I was referring to fat, and when it comes to power to weight ratio it's utterly useless. However it's true there is a bias towards upper body in climbing, but probably not as much of a bias that some other sports put on the body like cycling or running. You don't really grow big muscles, relatively speaking, climbing makes you lean and works out your entire body, after a certain point larger muscles actually become a burden... though strong feet and calf muscles are vital to be able to stick around on tiny feet holds and execute high tension manoeuvrers.

I would agree that doing a lot of cycling/mtb would probably have a slight negative affect on your climbing ability, i'm not sure about the reverse though - what most people don't realise is that climbing is a very technical sport, and you are totally using your legs most of the time, in fact one of the most obvious identifying behaviours in novices is people hauling themselves up walls using their arms and getting tired really quickly - it's not constant cut loose campusing, those are only the most extreme moves, the crux of a hard climb or a boulder problem.