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.

76-year-old prepared to run the world's toughest ultramarathon

Discover the World's Toughest Ultramarathons

76-year-old prepared to run the world's toughest ultramarathon

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

Male ultraunners: 12 of the best on the planet

USC vs. UCLA: O.J. Simpson's legacy leaves tangled emotions 50 years after 'Game of the Century' – Orange County Register

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

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

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

Ultra runners frustrated by 'toughest foot race in the world's' move away from Death Valley

Paula Radcliffe - Wikipedia