This is may be similar to the problem faced by St. Paul in his advice about food offered to idols. I recently watched a lecture by Bart Ehrman touching on this. Ehrman said that Paul advised against eating the food - not because idols represented real gods but because it might appear to non-Christians that Christians were honoring other gods.You hope that I'm joking that yoga comes from Hinduism and yoga literally means to yoke with their Gods? No I'm not joking. Look into it, it's but a google click away.
So by this reasoning, a Christian shouldn't actually fear that he/she is worshiping Hindu gods (or even demons) by practicing yoga, but a Christian might worry that non-Christians might think that. In this day, I don't think that worry is warranted. Most Westerners see yoga as exercise, so Christians ought to be able to use it that way without fear.
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