Once the province of gurus, yoga is now practised by such media-star personalities as Madonna and Sting. Yoga paraphernalia is everywhere, from malls to supermarkets, and the number of practitioners is growing daily. What prompted the change from spiritual to secular - and who is cashing in? Yoga Inc.examines the trends now sweeping the industry, from large 'McYoga' chains to yoga tournaments to high-profile yogis like Bikram Choudhury. Yoga Inc.asks- Can yoga survive with its good karma intact?