I ran over 100 miles through Death Valley in record heat after recovering from chemo — here's what it was like

Kent Keeler

This as-told-to essay is based on a conversation with Ray Zahab, a 55-year-old Canadian explorer and ultra-distance runner who has traversed nearly 12,400 miles across Earth's most extreme environments, from the Arctic to the Sahara. It's been edited for length and clarity.