Hal Koerner’s Field Guide to Ultrarunning: Training for an Ultramarathon, from 50K to 100 Miles and Beyond
Ultramarathons don’t leave much room for mistakes. 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.
