It’s no secret that if you plan to run in the toughest endurance races, you need to physically prepare for the extreme demands you will be subjecting your bod

When elite ultrarunners have a need for speed, they turn to coach Jason Koop. Now the sport’s leading coach makes his highly effective ultramarathon training

'Filled to the brim with advice, tips and inspiration to enable you to achieve your dreams over whatever distance you want your legs to carry you' - Chrissie We

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

Travis Macy summited glacial peaks in the French Alps, rappelled into vast limestone caves in China, and ran through parched deserts in Utah. Most famously, he