Upanishadic texts are the main source for the documented information about Yoga practices and related literature of this period. It is said that the Rishis slowly refined and developed Yoga and documented their practices and beliefs in the [[Upanishads (उपनिषदः)|Upanishads]].<ref name=":0" /> | Upanishadic texts are the main source for the documented information about Yoga practices and related literature of this period. It is said that the Rishis slowly refined and developed Yoga and documented their practices and beliefs in the [[Upanishads (उपनिषदः)|Upanishads]].<ref name=":0" /> |