Now 88 years old, Guru ji presides from his institute in Pune, India where he still supervises classes. Students come from all over the world to learn what has been branded "Iyengar yoga," a term he himself does not like to use, but a trademark with a huge following. Yoga and the commercial world surrounding it is now a multibillion-dollar industry, courses come in various styles and names, but the pioneer of it all, Guru Iyengar, prefers to keep it simple.