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Motivation, achievement and what it takes to endure with ultraendurance man Dean Karnazes #56 The secrets of motivation, from an ultraendurance athlete This week’s guest Dean Karnazes does it all—seriously. Not only is he a renowned endurance athlete and accomplished author, but he also works with several Fortune 500 companies all around the world, helping employees transform into elite leaders and managers. Dean is, in a word, impressive. So impressive that TIME named him one of the “Top 100 Most Influential People in the World” and Men’s Fitness honored him as one of the fittest men on the planet. Our topic this week? Motivation and achievement. Dean’s got it in spades, and so can you. We’re chatting nitty gritty, including how he knocked off 50 marathons spanning 50 U.S. states in just 50 days and what it takes to run 350 miles across 80 sleep-free hours. Even if you aren’t angling to run a marathon (or run anything for that matter), Dean’s got a lot to say on getting and staying motivated no matter wha