Jason Koop

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 methods available to ultrarunners of all abilities in his book Training Essentials for Ultrarunning.

Ultramarathoners have traditionally piled on the miles or tried an approach that worked for a friend. Yet ultramarathons are not just longer marathons; simply running more will