When a runner's heart stops during a marathon, it gets a lot of press — even though it's actually a pretty rare event. A more common killer among runners, and a condition that needs more prevention efforts, is heatstroke, according to a study by Israeli researchers.

Fifty years ago this week, teenager Jim Ryun of Wichita, Kan., ran a mile in under four minutes, the first high school boy to break the mythical barrier. But in the past few decades, the mile as a racing distance has fallen out of favor.

Ryan Lamppa is trying to bring it back.

Sixty years ago today, Roger Bannister accomplished something humans had only dreamed of decades earlier.

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.