Being equipped to survive does not equate having to run miles on end. This leads to a bigger question as to what are you trying to survive. In a hypothetical situation if you are in a plane crash in a remote area and survive (and say for the sake of argument, help is forthcoming and the weather is reasonable), would it be expected that you need to be in great shape to survive until help arrives? In this particular case, probably not, as a person in even poor shape (not severely disabled) can survive hours or a couple of days until SAR finds you.

At one time, I did high altitude mountain climbing (above 15000') and can tell you that I seen and heard of climbers who were my friends....even those who were in great physical condition who failed at survival. Other times, we hear incredible stories of survival from ordinary people who could not run to the end of block if they had to, yet walked for days and miles to help and safety. Other then an extreme medical emergency where help is very close by, I cannot foresee where a person would have to run for miles for help. If this occurs in the back country then the person running for help may have their own survival situation after they trip on an unseen tree root et al...

Due to bad knees after years of outdoor abuse, I can no longer run as much as I want...nor climb the high mountains for days on end. However being in my mid forties I am still in decent enough shape and can and have out walked/hiked people 1/2 my age who thought they could beat the "old man" which brings to mind the tortoise and the hare...

Young age + physical condition + boasting of the ability to run 5 or miles does not come nowhere close to equaling the years of wisdom and knowledge gleaned from actual hands on outdoors (or urban) experience. If I had to choose a person to help me when the chips are down, it would be an easy pick...