"Whether you are a newbie ultramarathoner or a season veteran, Hal’s down-to-earth advice will give you the confidence to get to the finish line or set a personal best.”

– Scott Jurek

“Hal’s Field Guide is a comprehensive guide to all things ultra. It typifies the man himselfa wealth of information, devoid of self-promotion. A near-limitless body of knowledge that, if you were sharing a trail with him, Hal would gladly share.”

– UltraRunning magazine

“Hal Koerner has a formula for fitness and life that keeps him winning and smiling. So follow his leadjust don’t try to keep up.”

– Outside magazine

“Hal’s honest, personal take is helpful and approachable for beginner and intermediate ultrarunners…Best for beginners or any athletes who need a quick reference on ‘what if’ situations.”

– TrailRunner magazine

“Ultra-distance champion Hal Koerner serves up amazing insights for training, gear, fueling and trail techniques in this comprehensive book.”

– Competitor magazine

“Hal Koerner’s ultra career was started deliberately, and, with plenty of mentors, he became one of the torchbearers of a new generation of trail fiends.”

– Runner’s World magazine

“Koerner brings both personal athletic credentials and a knowledge of the importances of equipment choices to his subject…A single-volume source for info on training and gear.”

– Canadian Running

“American ultrarunner Hal Koerner has written a comprehensive guide to this booming part of the sport.”

– Athletics Weekly

“A how-to manual chock full of valuable information for newbie and veteran ultramarathoners alike.”

– Competitor.com

“Koerner's book is the first ultrarunning nuts-and-bolts offering, and might just as well have been titled ‘Everything you always wanted to know about how to run 100 miles but were afraid to ask.’”

– MailTribune.com