“Nobody realized it at first, but Avi didn’t resurface after his plunge. He was underwater and sinking to the bottom, passing out at some point, for reasons that are still unknown. When he was next seen on the surface, at least eight and a half minutes after he’d jumped, he would be unconscious and in the arms of a rescue diver.” Extreme athletics are more popular than ever. But a death and lawsuit could force us to rethink how much is too much. From Outside: A Death at Tough Mudder.

+ WSJ: For these runners, a marathon is a warm-up.

+ And a story that’s more my speed: Why a brisk walk is better.