I took the Core class in New York last weekend. A few days later I was on the subway, a woman got on with a really bad, continuous cough and sat down behind me. I figured "why not" and started using one of the techniques I had been taught (wombing) on her lungs. After a few minutes she stopped coughing... and started singing! She got off the train singing quietly and with the happiest expression on her face. Ain't QT amazing?