subject says most of it. Do good runners hit "the wall" late in a marathon? Or is "the wall" just something that happens to your average hobby jogger who spent 3 months building up to 40 miles a week?
I guess I don't necessarily mean "good" either. I ran in college and wasn't very good but built up to 20 mile long runs over the summer, and while those were tiring and by the end I wanted them to be over, I never experienced anything that would be like hitting a wall. Did I just not go far enough, or did 8 years of fairly competitive running and 80-90 mile weeks just prepare my body to the point that there won't be a "wall" because my body has dealt with depleted glycogen stores before?