A decade ago, hardly anyone in China practiced yoga. Now it's almost as popular as in America. Recently, China and India staged a "yoga summit". Aged 92, B.K.S. Iyengar taught a masterclass. He urged the Chinese to practice deeply, for liberation. The one-party state appears enthused. Yoga isn't seen as a threat like Falun Gong, or the Dalai Lama; it supports "social harmony". Besides, a summit organiser said: "China has a tradition of embracing foreign cultures and making them its own. That's why it's been so vibrant."