Sorry, I know I said I would post this a long time ago,
This is what my certification manuel says about the origins of yoga:
"Myth: Yoga derives from hinduism:
Fact: Yoga predates Hinduism and was adopted bu Hinduism as well as other World religions
Yoga was developed in ancient times out of a desire for greater personal freedom, health, and long life, and heightened self-understanding. The classical techniques of yoga originated in India more than 5,000 years ago, despite beliefs of 500 B.C.E.
1920s-archeologists discovered that the Indus-Sarasvati Civilization which resembled Hindu Society and culture. Stone carvings depicting figures in yoga positions set grounds for belief that yoga pre-dates written history."
It talks about the history of Yoga alot more after that, but that's basically what it says about the origins.
This is taken from an article called "Yoga as a Spiritual PRactice" by Viki Distin
"Of the countless missunderstandings surrounding this practice, the one that I am most concerned with is the myth that Yoga is a religion. Yoga is not a religion. PEople of all faiths can practice. Gary KRaftsow, author of Yoga for Wellness was a keynote speaker for the midwest Yoga conference in 2000. I was there to hear this humble and knowledgeable Yogi talk about Yoga as a spiritual practice. One of his points was that people who are one of the five world religions (Christianity, Judaism, Buddhism, Hinduism, and ISlamic) would resonate most with yoga because they have cultivated compassion through their religion. Most ancient and contemporary yogis understand yoga as a path which is accessable to everyone. Many of the qualities which Yoga adresses (health, clear thinking, breath, patience, happiness) are qualities which are universal and not limited to one group. Because Yoga is accessable to everyone, different people will seek different types of yoga, or even different intentions. Some students are not interested in yoga as a spiritual practice, and that is fine too.
Yoga did origniate in India and therefore the Hindus where the first group of people to practice. However, the first yogis did not intend for people to attatch yoga to a particular faith. Now that ypga is practiced around the world, there are people of all faith practicing. ...
I believe that fear is what makes people judge people of other faiths, fear is what drives people to believe that yoga will conflict with their own religion. This practice requires courage, and the irony is that if people practice yoga, over time they will actually rid themselves of this dreaded cancer of fear.
So if Yoga is not a religion, what is it? It is best described as a "spiritual practice"/ It is an inner journey of spirit because of the connection of the breath and the "inward focus on thoughts and sensations. It is because of this "inner" alignment that people report they feel more spiritual and maybe even notice a stronger desire to learn more about their own faith....."