If you looked at it from a certain perspective, the exercises Amy Shipley did in Dahn Yoga were perfectly normal. Take what she was doing right now. It was near midnight. Amy and seven other devotees of Dahn Yoga — nearly all in their 20s, clad in blue tracksuits and barely functioning on three hours of sleep — were standing in a waist-deep fountain in the desert of Sedona, Arizona. On command from their Korean trainer, all eight would plunge their heads underwater and hold their breath until their lungs strained, finally rocketing to the surface gasping and shouting a devotional song to their Grand Master — a middle-aged Korean man called Ilchi Lee — and weeping to prove their sincerity. Then they’d be ordered to do it again, and properly this time. In this way, Amy and the others were saving their souls and rescuing the world from annihilation.
See? Totally normal.