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          Mark Ingram is tough to bring down

          • Alyssa Roenigk, ESPN Senior WriterAug 9, 2010, 04:02 PM ET
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              Alyssa Roenigk is a senior writer for ESPN whose assignments have taken her to six continents and caused her to commit countless acts of recklessness. (Follow @alyroe on Twitter).
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          In football, as in physics, pressure is the measurement of force upon an object. The smaller the object, the greater the pressure. Fortunately, at 215 rock-solid pounds, Mark Ingram is no small object.