Isn't it rather common that, when you start doing yoga, there could be some temporary reverse effects in the beginning, as the body is forced to try to put things right again? Although, to me yoga (done in the traditional way) is very slow and relaxing and not at all like workout, and I can imagine that some reverse effects will get more severe if you do it fast or try to force the body into new positions (which you should not, but which is difficult to avoid in the beginning).
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Re: Ahhh... my guess is it was just the sheer physical exertion...
