Hal Koerner is among America's best ultrarunners with podium results in more than 90 ultramarathons. 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 most experienced and recognized athletes in the sport. Ultramarathons don't leave much room for mistakes.
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