Running efficiently demands good technique, and running efficiently for 100 miles demands great technique. But the wonderful paradox of running is that getting started requires no technique. None at all. If you want to become a runner, get onto a trail, into the woods, or on a sidewalk or street and run. Go 50 yards if that's all you can handle. Tomorrow, you can go farther.
Scott Jurek, Eat and Run: My Unlikely Journey to Ultramarathon Greatness
running, ultrarunning