Every once in a while I am tempted to say that India is not all bad because it had yoga but
I just want to say that western gymnastics combined with western clinical hypnosis combined with breathing exercises western divers train in and western respiratory therapy is superior to Indian Yoga and all of India's greatest medical accomplishments in exercise medicine and that western nutritional science, western pharmacy & western herbalism is superior to Indian Ayurvedic nutrition and herbalism
There is a book about it called Yoga body and at least one other book I do not remember claiming something similar
I do feel Iyengar and other's did contribute some research trying different things on students & deserve some credit to making the world a better place through popularizing exercise even if they got most of it from the West and modified it
But that credit should go to those Individual Indian guys in modern time for working on improving what was given to them by western exercise science & not to all of India nor ancient Indian traditions