There is actually a Wind Relieving Yoga Posture! Perhaps practicing this posture will get rid of gasses BEFORE you get to class. Copy this URL to learn the pose: http://www.abc-of-yoga.com/yogapractice/windrelieving.asp
Have your perhaps started a new diet? Or are you just posting to be funny and see if you get any good responses? (You probably never imagined there was a yoga posture specifically for this issue!)
In truth, yoga helps with various physical ailments, from backpain to headaches to depression to gastrointestinal issues. People who practice yoga are proven do have fewer physical ailments than those who do not.