If you thought the scariest thing about yoga was accidentally farting during downward dog, think again. Because apparently, some hardcore yogis can do something with their bodies that is actually kind of terrifying. Originally called "Nauli," the practice been nicknamed "Alien Yoga" by contemporary yoga practitioners, the Independent reports.
The centuries-old yoga move, which is now trending on Instagram, involves exhaling completely before "isolating the abdomen" and then sucking it in under your ribcage, according to the Independent. When you see it, you'll understand the name "alien yoga," because these people appear to have been possessed by a force not of this earth.
It also has a bit of a creepy thinspo vibe.