Marathons have become too easy for some runners. What was once the pinnacle of achievement in a runner's life is now a stepping stone for extraordinary adventure in ultramarathoning. The number of ultrarunners-those running distances of 50k (31 miles), 50 miles, 100k (62 miles), or 100 miles-is growing astronomically each year. Dean Karnazes's Ultramarathon Man and Chris McDougall's Born to Run have inspired tens of thousands to try these seemingly...

"A no-nonsense, interactive guide that empowers all women at all levels to run their strongest, best marathon ever. As recently as 1966, women were forbidden to run in the marathon. Professionals-including doctors-believed it was physically impossible anddangerous for women to run more than a mile and a half. But as with many other barriers women have faced over time, we fought our way in. Today, women make up almost half of the marathoning population....

In Eat and Run, ultrarunner Scott Jurek opens up about his life and career as an elite athlete, and about the vegan diet that is key to his success. For nearly two decades, Scott Jurek has been a dominant force in the grueling and growing sport of ultrarunning. In 1999, as a compete unknown, he took the lead of the Western States Endurance Run, a 100-mile traverse over the old Gold Rush trails of the California Sierra Nevada. He won that race seven...