The technique was created by a German instructor
German yoga instructor Saskia Thode began practicing yoga in 2003, and a few years after moving to New York, she decided to combine her two passions, yoga and heavy metal, creating Yoga Metal classes.
According to Saskia, Yoga Metal elevates spirituality and the love of Metal to another level, and the official website provides all the playlists used in the classes.
Check out the explanatory video about Yoga Metal:

