This is from the same 1938 newsreel that shows Krishnamacharya demonstrating yoga. Here we see a young Iyengar (still alive, well, and doing yoga, BTW) doing advanced poses that constitute the advanced A & B astanga series. This is obviously well before Iyengar dropped the vinyasa aspect from his practice and rebranded it as "Iyengar Yoga", putting greater emphasis on allignment. (less info)