My answer: nothing.
And you know what? It’s ok.
Lots of poses are designed to massage internal organs and it’s pretty much guaranteed to release gas.
So what do you do when you let one go in class? I see two options:
A) Nothing. Just keep practicing and know that everyone will have forgotten about it by the time class is over, and more than half the people there will be sympathetic since they were that person last class.
B) Step out and use the bathroom. Yoga’s all about listening to your body, right?
Anyways, the whole point of this post is not to giggle about farts (ok, it is a little. They’re FUNNY!) but it’s to cut ourselves some slack. Embarrassing stuff is going to happen and there’s nothing we can do about it except smile, shake it off, and move on. It’s a lot like falling out of tree pose. Shake it off, take a breath, and try again.
Though in the case of farting in yoga, you might want to hold your breath a little longer.