When asked in an interview with Yoga Journal (december 2008), BKS Iyengar who will be celebrating his 90th birthday, said he himself does not even know what Iyengar Yoga is and that he just tries to get the physical body in line with the mental body, the mental body in line with the intellectual body, and the intellectual body in line with the spiritual body so they are all balanced. As he says, its just pure traditional yoga for our ancestors, gurus and Patanjali. BRILLIANT!
I encourage you to read this short and simple one page article. It is far more than about yoga, it is about the art of living and BKS Iyengar at 90 is living!