The litmus test for how valuable your class is for you is how you feel when you take the class. You should feel relaxed, content, and restful. Your body should feel a tiny bit challenged, but not exhausted. You should not feel pain, and if you do,
Your teacher should be open to discussing or acknowledging any problems.
If you feel agitated, defensive, or distracted, unfortunately, you've probably chosen the wrong teacher or class.
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But don't be discouraged, and don't throw the baby out with the bathwater: You know why you undertook yoga and are sure that it will address your needs. Consider looking for another class before deciding that yoga is not for you.