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

***Updated and expanded new edition*** An Updated, Interactive Guide to Take Your Running to the Next Level With 20 years of running and competing around the wo

Is your daily run starting to drag you down? Has running become a chore rather than the delight it once was? Then The Happy Runner is the answer for you. Author

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 legend Dean Karnazes has run 262 miles - the equivalent of ten marathons - without rest. He has run over mountains, across Death Valley, to the Sou