The Real Reason Marathoners Hit the Wall

A new study finds that your “critical speed” threshold drops in the last third of a marathon, which may explain why the distance produces so many blow-ups

Alex Hutchinson
Jul 23, 2019

Running After Melanoma

How I rediscovered the joy of trails and muddy shoes following a skin-cancer scare

Katie O'Reilly
Jun 30, 2019

What It Feels Like to Die from Heat Stroke

Your head is pounding, your muscles are cramping, and your heart is racing. Then you get dizzy and the vomiting starts. Heatstroke kills thousands of people every year. This is what it feels like—and how to know when you’re in danger.

Amy Ragsdale and Peter Stark
Jun 18, 2019