Simply put,&nbsp;the nation&rsquo;s toughest&nbsp;marathon. The&nbsp;Life Time Leadville Trail Marathon and Heavy Half&nbsp;presented by La Sportiva takes trail runners through the historic mining district&rsquo;s challenging trails to the highest point of any Leadville Race Series event: Mosquito Pass (13,185 feet). As you take on the baddest trails and thinnest air in all of endurance racing, you&rsquo;ll need all the Grit, Guts and Determination you can muster.
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