Modern yoga seems synonymous with postures, yet very few of them are described in ancient texts. So where did they come from and what are they for? And how does one practice authentically? Try sitting and holding an arm above your head for several decades. That's the essence of original yoga in ascetic traditions. This got combined in the medieval era with esoteric techniques from Tantric sects. Modern styles are a hybrid of exercise, wellness and threads from the distant past...