Huh....interesting. Thanks for that perspective but I have never been told that before, at least on a uniform basis.
I've seen a roughly even mix of skinny, mid sized and even some bigger dudes be able to run the mountains, but as a rule the bigger they are (not just gutted or fat, but also meatheads that can bench a fridge) the slower they have been. Some still make it because they're determined to, but are usually slower getting there. I've seen plenty of bean poles that can't make it either, but it is more mental on their part than physical, I think. I am sure exceptions exist on all levels.
