For most, the origins of Yogic history may be enveloped in obscurity and uncertainty due to the fact that all Vedic and post Vedic ancient knowledge usually weren’t attributed to a single author or written down. They were all contributed to various individuals that acquired this knowledge through Āgama or “that which has come down”, which meant that the source was unknown and divine.
Śrutis (the Vedic literature which also had yogic teachings as a part of it) was considered author-less, and that were transmitted verbally across centuries. This non-changing oral transference of sacred texts also had secrecy as part of its teachings, to ensure accuracy. Many of the early sacred notes on yoga were written and rewritten on fragile parchment paper, which was easily damaged, destroyed or lost.