Not everyone finds whale noises and wind-chimes soothing – for some, the abrasive, blood-spattered sounds of Slayer, Pig Destroyer or Sepultura do far more to induce the kind of spiritual inner-peace that yoga aims to foster.

Hence the current trend – both here and in the US – as for classes such as Metal Yoga Bones (slogan: “Unleash Your Inner Beast”) and Black Yoga (“You Can’t Appreciate The Light Until You Understand The Darkness”).

We raise our voices to Satan with a dark and deep howl

“My class starts off with a lot of growling, screaming, and hitting the floor with our fists,” says Brooklyn’s Saskia Thode, who set up Metal Yoga Bones. “This gives people a chance to release some of the anger, stress and the darkness inside. And to close the class, we raise our voices to Satan with a dark and deep howl.”

We always figured Satan to be more of a Crossfit bro than a yoga dude, but whatever. We’re sure he appreciates the gesture anyway. \m/ \m/