Through the spring, NPR will be tracking eight runners competing in the 2014 Boston Marathon. This is the story of Eric Ashe, the fastest of the eight.
At mile 10, he could tell it was going to be close. Eric had consistently run each mile at a 4:47 pace.
He had to finish 13.1 miles in 65 minutes to qualify for a spot in the Olympic trials in Los Angeles in 2016.