Not to diminish Dean Karnazes&#x27; feat, but you might be interested to find out someone recently did 50 Ironman races in 50 days (<a href="http:&#x2F;&#x2F;www.runnersworld.com&#x2F;general-interest&#x2F;50-ironmans-in-50-days-in-50-states" rel="nofollow">http:&#x2F;&#x2F;www.runnersworld.com&#x2F;general-interest&#x2F;50-ironmans-in-...</a>). An Ironman includes a 2.4 mile swim and a 100 mile bike ride in addition to a full-length marathon.