You should totally go! Your meare existance there will trigger them lol. You will actually be able to do all the poses properly and look good doing it, and it will not be a waste of your time - as you know, yoga is one of those activities you get out what you put in, so even a basic class will be good when you don't dog it like fatties do. Did a tabatas class awhile back, and even though the activities are only 20 seconds at a time, the fatties would stop after 12-15 seconds (pathetic). Just make sure you are super sweet and nice, it will make the Obeasts rage even more...