Training for an Ultramarathon - 50K to 100 Miles and Beyond Ultramarathon doesn't leave much room for mistakes. Now runners can avoid learning the hard way and 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 recognised athletes in the sport. Hal Koerner is among America's best ultrarunners with podium results in more than 90 ultramarathons. In his smart, down-to-earth handbook, Koerner shares hard-earned wisdom, field-tested habits, and insider tips to help runners prepare for a first ultra or set a new ultra PB. Runners will find out everything they need to know about how to train for an ultramarathon, including the best gear for ultrarunning, fueling and hydration guidelines, choosing an ultra race, trail-running technique, first-aid advice, beating the weather, smart race-day game plans, crew and pacer tips, and mental strategies to g