Ultra is notoriously unforgiving of mistakes. This comprehensive handbook includes the hard-won wisdom of ultrarunner Hal Koerner. It includes field-tested habits and insider tips about the best gear, fuel and hydration guidelines, technique, first-aid advice, and how to deal with altitude, storms, and heat. Use it to plan your race, choose your crew and develop mental strategies for 50k, 50-mile and 100-mile races.