What Rubbish , people with closed minds who cannot see it is and was always an experiment what happens in my body-mind when I do this when I breathe like this and assume this posture. Groups of what would have been "spiritual outsiders" outsiders , narts , Agoris , the would be ancestors of Yoga in their huts or in places away from other humans doing strange weird and wonderful things and then from this was culled what is commonly held today as Yoga. safe practice, conventional practice, practicing a form of Yoga , with accredited teachers and so on, that is Ok for beginners and people who enjoy staying o this superficial level , but braver souls abandon convention and allow asanas to emerge as they will. God Bless innovators