Eat and Run

''Run until you can''t run anymore. Then run some more. Find a new source of energy and will. Then run even faster.'' The words of Scott Jurek, a dominant force - and darling - in the gruelling and growing sport of ultrarunning for more than a decade. In 1999, as a complete unknown, he took the lead in the Western States Endurance Run, a 100-mile jaunt over the Gold Rush trails of America''s Sierr...