By Eric Rogell
from Discovery.com

CrossFit works your whole body with exercises like tire flipping and sled pushing (Photo: SF CrossFit)
So, you’ve decided to finally do something about your sad state of fitness, and you keep hearing from CrossFit disciples how effective it is for whipping people into shape. Fast.
But you’ve also heard all the CrossFit horror stories: people puking in the corner, passing out on ...
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