Hills are terrific for running
Being a lifelong runner, knowing what running gives me, a variety of factors - that is what motivates me.
The marathon can humble you.
I want to run until I can't run
My guess is many top athletes, distance runners included, use performance-enhancing drugs, enough so that the problem must be tackled.
Every time I bomb out, I have to come back. I have a feeling after a bad race that my next one will be good.