Public school yoga instructor Katie Campbell proudly looks out at 23 first graders as they contain their squirming in a kid-friendly version of the lotus position.
In a voice barely above a whisper, she says into her microphone: "Why look at everyone showing me they're ready for yoga. A-plus, plus, plus!"
Then the lesson begins with deep breathing and stretches common to many yoga classes. But there is no chanting of "om," no words spoken in the Indian language of Sanskrit nor talk of "mindfulness" or clasping hands in the prayer position.
Campbell avoids those potential pitfalls for the Encinitas Union School District, which is facing the threat of a lawsuit as it launches what is believed to be the country's most comprehensive yoga program for a public school system.