didn't get out yet, but this looks like a good article. http://runningtimes.com/Article.aspx?ArticleID=25970&cm_mmc=RT-_-911432-_-05152012-_-RunningLongevity OK - I ran. Decent energy level - decent turnover. Bit of a neg split even though I didn't feel very fresh in the last half 6@ 7:27 ave pace
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