117 marathons, 52 days, 32 pairs of shoes, 57 years old: A fascinating glimpse inside the mind of an ultramarathon runner and the inspirational saga of his phenomenal journey running across America.

The ultimate endurance athlete, Marshall Ulrich has run more than 100 foot races averaging over 100 miles each, completed 12 expedition-length adventure races, and ascended the Seven Summits - including Mount Everest - all on his first attempt. Yet his run from California to New York- the equivalent of running two marathons and a 10K every day for nearly two months straight - proved to be his most challenging effort yet.

Featured in the recent documentary film, Running America, Ulrich clocked the 3rd fastest transcontinental crossing to date and set new records in multiple divisions. In Running on Empty, he shares the gritty backstory, including brushes with death, run-ins with the police, and the excruciating punishments he endured at the mercy of his maxed-out body. Ulrich also reached back nearly 30 years to when the death of the woman he loved drove him to begin running - and his dawning realization that he felt truly alive only when pushed to the limits.

Filled with mind-blowing stories from the road and his sensational career, Ulrich's memoir imbues an incredible read with a universal message for athletes and nonathletes alike: face the toughest challenges, overcome debilitating setbacks, and find deep fulfillment in something greater than achievement