Patanjali's text is short, dry, and mostly about the mind. The eight limbs are ethical restraints, observances, posture, breath control, withdrawal of the senses, concentration, meditation, and absorption — and asana, the one that global yoga is built on, receives three sutras which say roughly that the seat should be steady and comfortable. The third chapter is largely a catalogue of siddhis, the powers said to arise from deep concentration: knowledge of past lives, invisibility, entering another body. Patanjali treats them as obstacles. Scholars of modern yoga have documented how much of contemporary postural practice descends from twentieth-century Mysore gymnastics and European physical culture rather than from this text, and the Yoga Sutras were themselves fairly obscure in India until Vivekananda and later Western enthusiasts elevated them. The philosophical framework is Samkhya's dualism of consciousness and matter, which sits awkwardly with the Vedanta most Hindus have absorbed, and the sutras' God is optional — a useful object of contemplation rather than a creator.