Most of the myths concerning what women can't do during their periods — hang out around bears, swim, get pregnant, share a tent with menfolk — are easily debunked. But despite all of the fun-loving, white yoga pants-wearing gals jumping around in tampon commercials, no one seems to know whether it's actually safe to practice yoga while on the rag. We talked to some experts about the possible perils of doing headstands on your period and a super fun term called "retrograde menstruation."
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