64: The Hardest Human Alive, Ultra Runner

Navy SEAL and endurance athlete, David Goggins, joins the Finding Mastery podcast to share his quest to become the hardest human alive.

Zen, Ultra-running and the Art of Suffering

World's Toughest Races: These Are the Hardest Races in the World

The World's Oldest Ultramarathon Runner Is Racing against Death. : r/running

Ten-minute miles are the new eight': the senior ultrarunners pushing the envelope, Sport

Last Man Standing Ultramarathon

Boston Marathon Qualifying - Races to Help You Score a BQ

Insane world of 'toughest man alive' David Goggins who ran 101 miles in just 19hrs - as his brutal workouts are revealed

Top 5 scariest ultra marathons in the world

World's Toughest Races: These Are the Hardest Races in the World

Bangalore Runners

What You Need to Know About Running In Cold Weather, from Benefits to Safety

20 Most Difficult Super Mario Levels Of All Time

How Ultrarunner Camille Herron Set Another World Record - The New York Times

The Marathon des Sables is the world's toughest race. This man veered 291km off course — and survived - ABC News