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Dean Karnazes has run most of the toughest endurance races in existence. He has completed 50 marathons in 50 days, won the Badwater race in Death Valley and ran 350 miles in just over 80 hours\u2026without stopping. \xa0Time Magazine named him one of the \u201cTop 100 Most Influential People in the World.\u201d

He\u2019s also a NYT Bestselling author. Among his books, Dean\u2019s most recent is \u201cUltramarathon Man: Confessions of an All-Night Runner.\u201d He\u2019s also written a book called \u201cThe Road to Sparta\u201d regarding Dean\u2019s faithful re-creation of the run that the Athenian Pheidippides took from Athens to Sparta in 490 BCE. Mark and Dean \xa0discuss the upcoming \u201c300\u201d ruck that Mark will do in September from Sparta to Thermopylae and get into the importance of mental toughness in ultra-endurance sports, and the preparation that goes into one of Dean\u2019s feats of endurance. \xa0We all need to welcome\xa0greatness and use obstacles for our greatest\xa0successes.\xa0 Listen in to understand Dean\u2019s determination and mindset, and to be inspired.