See Vedic Wisdom has been here since time immemorial. There is no fixed time as to when the knowledge began or started. It was not started by any one person alone. It was something that people got when they went deep into meditation.
Many Rishis meditated and when they meditated they heard something in the deep silence. Whatever they heard, they started saying it and asked somebody to note it down. This was then passed down from person to person by word of mouth - The Oral Tradition.
Spreading yoga for better health: Gurudev gave the keynote address on the occasion of the first ever Yoga Day at the United Nations Headquarters in New York Yoga is a very specialised section in the Art of Living catering to every age group