you would never know this, because they only teach you the cover up methods of breathing, and concentration. I have been through this myself, unfortunately I was on my own as a self-learning, and I got heavy ritual books called “ The Awakening of Healing Light” by Mantak chia , I mentioned the name forcefully to warn anybody who had the intention, and get brain washed about this Yoga thing. In fact, they teach you “satanic rituals”, I know it’s shocking but what you can say about a tons of warnings in those cursed books, and it hold no responsibility for whoever try this without a “Guru”. As a matter of facts, I kept e-mailing them, to find out what actually is happening to me, getting nothing but the evil heavy air.
Does this kindly seems to you a “Good Energy”?? I’d say thanks God the majority of people has dormant spiritual powers, so those evil results, wouldn’t be realizable until a good punch of time, counts to years. But I tell you, If you are a good person, with high spirituals the probability is high, you got fights everyday just to try to defeat, and get advantage of your high good powers. Beware those rituals of white magic might become serious, and turns into bloody spirit embodiments, and who plays with matches, surely got burned. Seriously talking, even in the spirit world, if a spirit opt to cross its realm, then it’s evil one, and wants something in return, Be Careful, it’s not a game, the price could be your life.