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The ultimate guide to mental toughness by James "Iron Cowboy" Lawrence -- the greatest endurance athlete in human history.. Lawrence's accomplishments are nearly impossible to comprehend. After breaking two Guinness World Records, he shattered possibilities in 2015 by completing 50 full-distance triathlons in 50 states in 50 consecutive days. Yes, THE IRONMAN®, "the single most difficult day in sports"- a 2.4-mile swim, 112 miles on a bike, then a 26.2-mile run, all completed in under 17 hours. It is a race so intense that less than .01% of the population have completed one.. Afterwards, Lawrence subjected his body to exhaustive physical testing, to every genetic test known to science. The stunning discovery is that physically, James Lawrence is unspecial in every way.