Running cleared the day's cobwebs from my mind and focused my thinking, and gave me time and space to sort out anything that was bothering me, or to detach and think of nothing at all. When it's pouring rain and you're bowling along through the wet, there's satisfaction in knowing you're out there and the others aren't.
Running became boring because it's so predictable.
I got to a point where I knew what my competition could do.
As a teenager I had no idea that I had the potential to win an Olympic gold medal and my athletic career developed only by lucky circumstances.