Running on Empty

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 - includ...