Holy cow. Mary's Skullpt classes will WORK you!
I've been coming to Sutra since Jan of 2013 and I've fallen in love with their classes and the wonderful people who run this business (as well as their instructors). They are passionate about yoga, health, and living a life of balance. They also embody a strong sense of community. They are always holding events and other yoga experiences around the valley.
The monthly membership cost may seem like a lot but I assure you, its worth it. So glad to have this place here in PHX!