Interesting video on the origin of Yoga. This 7 minute video goes into the start of Yoga, which was lead by a man named Adiyogi, over 15,000 years ago.
Full transcript of the video can be found here: http://isha.sadhguru.org/blog/video/the-origin-of-yoga/http://isha.sadhguru.org/blog/video/the-origin-of-yoga/
Enjoy..