CBS's Susan Koeppen tells the story of Rachel Schneider, who says her back problems were exacerbated by inappropriate yoga poses. Koeppen also points out that there are no national standards for yoga teacher certification, and that such certification can be purchased over the Internet with almost no training. Of course, an unqualified trainer is dangerous in any physical activity, and such people aren't limited to yoga. Indeed, it's smart to check someone's credentials no matter what they're teaching you.
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