B.K.S. Iyengar came to Europe in the 20th century and did much to popularise yoga in the West. He, in turn, had been taught by Tirumalai Krishnamacharya, who was responsible for a great revival of physical yoga in the early 20th century in India. My own longtime teacher, Ilonka Miklosi studied with Iyengar but she has moved away from this style over the years. Iyengar’s style is precise and demanding of the practitioner and with the evolution of other styles of yoga in more recent years, his teaching has been viewed as rigid and old-fashioned. The people who have the bodies that can accommodate this style of yoga flourish with it, however, and it has spawned so many great teachers, such as the late Vanda Scaravelli, and his books are a treasure trove of knowledge.