Ultramarathon doesn’t leave much room for mistakes. Don’t learn the hard way, get a jump on training for ultramarathon with Hal Koerner’s Field Guide to Ultrarunning, a comprehensive guide to running 30 to 100 miles and beyond.

Hal Koerner is America’s top ultrarunner with podium results in more than 90 ultramarathons. In his Field Guide, Koerner reveals hard-earned wisdom, smart habits, and reliable tips to help you prepare for your most epic runs. You’ll hear entertaining stories of trailside woe and practical advice on the smartest ways to fuel, trail running technique, and mental strategies to carry you to the finish line. Koerner offers 3 detailed training plans to prepare for 50K, 100K, and 100-mile ultramarathons.