The yoga teacher sits in a lotus position atop a polished wooden platform. Behind her, verdant woods are visible through panoramic windows. Gentle music tinkles from overhead speakers. Two dozen students in spandex outfits, most of them women, settle onto purple and blue mats to begin the class with ujjayi, a breathing exercise. Their instructor, Cindy Senarighi, recommends today's mantra. "'Yahweh' is a great breath prayer," she says. "The Jesus Prayer also works. Now lift your arms in praise to the Lord."