Relentless Forward Progress: A Guide to Running Ultramarathons by Bryon Powell (Paperback, 2011)

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The number of ultrarunners--those running distances of 50k (31miles), 50 miles, 100k (62 miles), or 100 miles--is growing astronomically each year. Dean Karnazes' Ultramarathon Man and Chris McDougall's Born to Run have inspired tens of thousands to try these seemingly superhuman distances.