I'm so tired...

Since I have a job that allows for a life now I signed up for a Birkram yoga class. Birkram yoga is the kind where you do 26 poses in a 5000 degree room for an hour and a half. Just got back from my second class and a feel great but exhausted. I did managed to stay in the room both the first and second time, and this time was definitely easier. My goal is to go again on tuesday.