I just did a class tonight. It's 90 minutes in a room over 100 degrees. It's amazing how much the temp affects one's flexibility. By the end of the class, I could put my legs straight in front of me and touch my head to my knees...and I'm not flexible. Some of the positions are ridiculously difficult.
At the end of class, I literally thought I was going to faint, but 5 minutes later, I felt like I was high, yet with excellent focus and energy.
I could see myself getting pretty hooked on this. They say you need about 3 classes per week to really get the benefits.
I'm also interested in finding out how this contributes to/detracts from recovery.