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From Barnes & Noble
There is endurance and then there is something beyond endurance. When 57-year-old Marshall Ulrich ran the equivalents of 117 marathons in 52 days (yes, you read right!), he crossed beyond the threshold that even world-class ultrarunners can hope to achieve. In Running on Empty, the "Endurance King" chronicles his record-smashing 2008 transcontinental run and describes what drove him to his relentless efforts to push his body to its limits. The next stage for readers of Dean Karnazes' Ultramarathon Man and Chris McDougall's Born to Run.