Hal Koerner has raced ultramarathons across the globe and set fastest known time records on the Colorado Trail and the John Muir Trail. He was featured in the 2011 film Unbreakable: The Western States 100 and in 2014 was called 'The Happiest Runner on Earth' by Outside magazine.
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Ultramarathons don't leave much room for mistakes. Don't learn the hard way: get a jump on training for an ultramarathon with Hal Koerner's Field Guide to Ultrarunning, a comprehensive handbook to running 30 to 100 miles and beyond, written by one of the ... SEE MORE