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I learned this not too long ago, and I'm not gonna lie, I was a bit floored. I was always under the impression that all it was about was ''helping'' back problems by cracking people's backs and such, and that it was all probably just placebo.
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[url=http://i.imgur.com/bzJ5Q21.jpg]I can't see the video[/url] but I am willing to bet it's Concordance.
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