This half marathon and 10K celebrates the city's emergence from ... June 28: Life Time Leadville Trail Marathon and Heavy Half presented by La Sportiva, Colo. – The nation's toughest marathon ...

In contrast, an unacclimated rider would produce only 73%. At Leadville’s cruising altitude of 10k, these numbers drop ...

This half marathon and 10K celebrates the city's emergence from winter hibernation and delivers a picturesque ... This is a Life Time Grand Prix event. June 28: Life Time Leadville Trail Marathon and ...