Dean Karnazes is a legendary ultramarathoner who has completed some of the most grueling races on the planet. The 61-year old has run all over the world, including 50 marathons in 50 days across 50 states, and once ran 350 miles (560 km) in 80 hours and 44 minutes... without sleep.

But Dean's impact goes far beyond his astonishing feats of endurance. Through his books, speaking engagements, and unwavering passion for the sport, Karnazes has inspired millions around the world to lace up their shoes and discover the transformative power of running. His story is one of perseverance, mental toughness, and a relentless pursuit of pushing human limits.

In our conversation, we dive into Dean's remarkable running journey, his views on the state of running, and wax about one of his all time heroes - Terry Fox.

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No Finish Lines is about life’s never ending race, our inherent desire to find new ground, personally, professionally, and on each run. In every episode, iRun editor Ben Kaplan talks to an athlete, author or other world-class super-achiever, not about their successes, but about their setbacks. No Finish Lines is about our inherent will to get back in the race again.

No Finish Lines is produced by The All-Season Co. For questions, sponsorships or feedback, please send us an email at info@allseasonco.com.