More on the secret practices of Yoga...

That which is considered secret in the Yoga tradition is everything that would be misconstrued by a lay person, misinterpreted and taken out of context. They are not kept secret for any other reason then that. They are not secret amongst those who practice seriously and deeply as a lifestyle.

Also, what is somehow amazing, is that 'secret' or advanced concepts can be offered out loud into the space of a yoga class, and only those with the appropriate level of undersanding will perceive the true meaning of the words (or really the experience that the words point to). To others, the same words will be meaningless or have a more gross (physical or simple) meaning. But in the garden of the beginner's mind the seed will be planted, and should the appropriate level of consciousness emerge, the seed and sprout and the words will show their true intended meaning through experience.