In his great book called 'The Coming Revolution', Rav Zamir Cohen has a whole chapter showing before and after pictures of how laying tefillin can change the colour of a man's aura; and how covering the hair can do the same for a married woman.
In the same vein, many pictures abound of holy rabbis who have a white light visibly shining from their face, or around them: that's their aura. It's so holy, pure and strong, even regular photography can pick it up. Remember the light that was shining from Moshe Rabbenu's face after he'd been talking to G-d non-stop for 40 days? It's the same idea.
Last year, I met a woman who did 'kosher healing', apparently in a 100% halachically-acceptable way (although now, I'm seeing that a lot of people make that claim for the alternative healing things they're involved with, and it's not always true.)
Anyway, she seemed pretty nice and frum, and one of the stories she told me was about trying to do a 'healing session' on someone who had come to her, who was really into their yoga.
Her client was a baal teshuva, or recent returnee to Judaism, and she'd left a lot of her old lifestyle and beliefs behind - but she couldn't quite disconnect from the yoga. Every day, she'd do her half an hour of meditation, and she still attended a few classes a week at her local yoga studio in Tel Aviv, where she lived.
The healing woman told me:
"Once, she came to me straight after doing a yoga class, and her aura was completely gone. I couldn't 'feel' anything to work with; it was like trying to work with a plastic mannequin, not a living, breathing human being."
The healing lady was so shocked by the phenomenon, she mentioned it to her client, to try to work out what had caused it. The client couldn't think of anything - except that she'd just been to a yoga class.
The next week, she came a different day - and her aura was back. The healer decided to do an experiment. She asked her client to schedule a few sessions in a row, some after her yoga class, and some not, so she could see if a pattern would emerge.
Every time the client came after doing yoga, her aura, or protective outer energy field, was completely gone.
Now, you can say all this is superstitious clap-trap; you can dismiss this as an old wives' tale; you can jump up and down and say there's 'nothing wrong' with doing a bit of stretching.
What I can tell you is this: yoga, and other disciplines like it, which are firmly rooted in idol worshipping practises and philosophies, can and do cause damage to a Jewish soul.
It may not be obvious to us, which is why we need to check things out very carefully with our learned rabbis, who usually know much more than we do about deep spiritual issues that most of us don't have the first clue about.
As we mentioned in a previous post, if the practitioner isn't a G-d-fearing person, they are already not going to be a healthy spiritual source of healing for you, whatever they're doing.
If what they're doing is also spiritually unhealthy or damaging, then you're really asking for trouble.
I don't know what all this means, practically - I'm still trying to work it out myself. But it seems wise to start exercising more caution about the non-Jewish disciplines and ideas and therapies we get caught up in. Yes, they sound good. Often, they even work - but if that 'healing energy' is not coming from G-d, then it's coming from a very dark place. And speaking for myself, that's definitely NOT something I want to get involved with.