Hatha yoga
Gavin Flood dates this text, along with other Yoga Upanishads, to be probably from the 100 BCE to 300 CE period. Guy Beck dates it to be probably from the pre-Christian era and the earliest document on the Yoga of sacred sound, while Georg Feuerstein suggests that the text is likely from a period in early 1st millennium CE. Mikel Burley states that this text does not provide techniques of Hatha Yoga, but probably influenced the later Hatha yoga texts.