Why do you like long-distance running?

"I like the challenge of endurance running. You're one-to-one with your body, consciously pushing against your limits to overcome fatigue, to push yourself further. Running is a challenge for my body."

- WOLFGANG KETTERLE, PH.D, The Nobel Prize-winning physicist from MIT talks about his 2:50 marathon and how running helps him stay at the top of science.

Further reading on this @

http://www.runnersworld.com/article/1,7124,s6-243-410--13337-0,00.html