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 I have a lot of respect for long distance runners, probably because I was always horrible at it and know how tough it is.  I had to do a lot of running when I was in the military (15 years), and I never enjoyed it much.  Especially those 2 x 10 forced marches.
 You do 10 miles one day, and 10 miles the next day.  With full gear, weapon, and combat boots on.  Those were really a killer but when it was over, you felt awesome.
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