EVERYTHING in secular human society is polluted to one degree or another. We live with a fetid cesspool even if we want to get out, try to keep to the extreme shallows, and fuss about all the worldlings splashing about with gusto and spattering what little seems clean if only they are able.
Stretching exercises do not have to be low grade witchcraft but be prepared for an uphill battle to not duplicate the appearance of things other people are doing.
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Yoga is not “stretching exercises!”
Yoga is Transcendental meditation through physical contortion.
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