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The rec center

The coaching: Teachers sometimes have group-fitness (as opposed to yoga-specific) certification, which is not ideal.

The classes: Usually a few styles with BYO props.

The crowd: Classes tend to be crowded.

The cost: Many charge by the class, others by the year. Discounts are often available for residents.

In the end, what matters is that you're comfortable in the class. If that first one isn't a good fit, try a different style, a different teacher, or both. And once you find that perfect combination, stick with it, says Dr. McCall: "You'll get the most benefits from yoga if you're a regular."