Could it be that there is a 4th aspect of running most of us don't know about? A secret?
I think YES! And the secret is (promise not to tell) orientation. The WHY of running. Most runners never develop a 'mission' for their effort. They fail to see themselves in terms of the history of track or the social history of the world. Runners can exert an enormous influence on other people that non-runners could never do. We have the opportunity to change behavior patterns. We can litterly change the world.
Look at the history of running in America for example. In 1960 there were a few runners; By 1980 there were millions of runners. What happened between 1960 and 1980 to cause that change? Someone out there decided that through running they could change the world. And it happened!
The 60's through the 80's were the GOLDEN AGE of running in America. We had MORE great distance runners than any country in the world.
Then we started looking introvertedly and the greatness faded away. We run for SELF now. Afraid to work too hard (injury) or too long (doesn't help you anyhow).
Ah! But remember, there is a secret (you promised not to tell): If you run unselfishly for the benefit, happiness, and welfare of other people (with nothing in it for you personally) you run better. MUCH BETTER!!!!