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It's one thing to marvel at the Olympic paragons of Gabby Douglas, Missy Franklin, or Usain Bolt. It's another to dive into a demanding physical regimen as if you're an athlete when you haven't been properly trained. But that may very well be happening as countless Americans take on high-intensity fitness programs like CrossFit, Insanity, or boot camps that push them to the brink of, or well past,...
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