hide captionShut up and suffer, or split?

You've made a commitment to yoga to improve your health.

So there you are in class, with a teacher you've never had before. And while you're flipping your down dog, you realize you're not exactly flipping over the teacher.

Maybe the teacher is a yoga bully: "OK, everybody up for wheel! People in the back row, what's your problem?"

Maybe the teacher is making absurd claims about yoga ("Doing an inversion is like having a face-lift!").

Or it's hot yoga and you're thirsty and the teacher says, "Don't drink!" But ... you are really thirsty!

Or maybe the teacher just doesn't seem to know what he or she is doing. And is actually reading from a yoga book to describe a pose.

I've been in all those situations. (I've also been in classes with amazing teachers who make the minutes fly by and who make me feel so much better than when I did my first down dog of the day, so don't accuse me of being a yoga basher.)

And I know that staying with a yoga class can be a very good thing. Studies show that the ancient practice can improve flexibility, offer relief for back pain and reduce stress.

But in those classes where everything isn't flowing my way, the question lurks: Should I pack my mat and go? Or is that bad yoga etiquette? And is there any benefit to sticking it out?

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When A Yoga Teacher Ticks You Off, Is It Rude to Walk Out?

Los Angeles: A 12-year-old girl from California has become the youngest female certified yoga instructor in the United States.

Jaysea DeVoe joined the yoga staff at Bergamot Spa in March this year, and since then the tween has attracted a growing following of devotees both at home and from abroad.

Jaysea discovered yoga when she was just 9 and gradually became interested in the meditation, which she practices each morning for 30 minutes to an hour.

"I love how yoga makes my body feel and my soul. It's such a spiritual practise where I can meditate, turn the music on and flow through the poses," she said.

Jaysea spent 18 months in training with local yogi Lindsay Russo in order to become a registered yoga teacher with the national Yoga Alliance, 'U-T San Diego' reported.

Russo recommended her for the 200-hour certification programme at The Soul of Yoga school in Encinitas.

In March, Jaysea completed the five-month programme with her two friends, aged 13 and 15.

Russo said the three girls not only developed yoga skills but also confidence in public speaking and interaction.

"Her practise embodies the essence of yoga. She's very focused and not easily distracted and she's very enthusiastic," Russo said about Jaysea.

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12-year-old girl becomes US' youngest Yoga teacher