I got my ass kicked by Spin Class

You read that right. Spin class kicked my ass. I went to my first spin class yesterday. One of my bosses led the class for the first 15 mins. That was brutal. Then the instructor came to teach her class. Hers wasn't as bad. I am sure that I wsn't working as hard as I could, but I feel it today anyway. It was brutal. My ass HURTS. At least I burned off my lunch!