You've probably felt your joints crack or pop when you exercise. There are a few reasons why this happens, but unless there's pain or swelling, you have nothing to worry about. Here's why.
from Lifehacker http://feeds.gawker.com/~r/lifehacker/full/~3/pGBxLJNmt2s/why-your-joints-crack-and-pop-when-you-exercise-1675377161
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