From Time:

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."

The platform is an altar, the tinkly tune is praise music, and the practice is Christian yoga. Senarighi’s class, called Yogadevotion and taught in the main chapel of St. Andrew’s Lutheran Church in Mahtomedi, Minn., is part of a fast-growing movement that seeks to retool the 5,000-year-old practice of yoga to fit Christ’s teachings. From Phoenix, Ariz., to Pittsburgh, Pa., from Grand Rapids, Mich., to New York City, hundreds of Christian yoga classes are in session. A national association of Christian yoga teachers was started in July, and a slew of books and videos are about to hit the market. But the very phrase stiffens yoga purists and some Christians–including a rather influential Catholic–who insist yoga cannot be separated from its Hindu roots.