This documentary intrigued me, especially the convent that claims to be the only one still teaching and practicing the secret yogas. One they mentioned was "magic fire" which I believe refers to Tummo meditation, which is basically the meditation technique Wim Hof has introduced to the West. I got into this a bit some years ago, certainly making myself dizzy and hyperventilated many times, but I'm going to enroll in his course again, now armed with a lot more esoteric understanding and purpose.