The following is excerpted from the wonderful 'Iyengar, The Yoga Master: Essays and Appreciations'. In this book, many students share their experiences having spent time under the tutelage of B.K.S Iyengar. One of them Dr. Krishna Raman, was a graduate in Medicine from Madras Medical College, Chennai in India. Dr Raman has spent much of his life researching the clinical and medical benefits of hatha yoga.
As I have explained many times to our Teacher Trainee students, the modern way to approach standing and balancing poses (take triangle and warrior 3 for examples) is with a bend in the front or balancing leg. The theory being that this is 'safer'. Even though there is no actual research to support this. All the research available tells us to