Vinyasa

I thought I would try something different at the gym today, so I headed to Vinyasa. I have tried this class before, so I knew I was "asking for it". So it began....downward dog, warrior pose, chair. Not a problem until the heat kicked in. Once again I am about 20 minutes into the class, and I am sweating like a pig. I just don't get it. I take some pretty difficult weight classes and a kick my butt weekly Zumba class. I mentally think I am tough, but then I go get whipped at a Zen class? Oh well, I like it!