“There are so many people doing yoga just for the sake of asana”
This should not even be associated with yoga. It should just simply be called physical excercise, or asana practice. But if the name is changed, thousands of businesses will loose profit. The so called “yoga” that is being practiced in the West is a great distortion of what was supposed to be a science and technology towards one’s enlightenment.
“I’m just wondering if is it possible to get enlightened without the desire to do so. Say, one going to the yoga classes and have no idea what he is doing ( the teacher show some kundalini rising techniques and advanced pranayam), is there a chance that one can get enlightened without knowing it??”
It is possible to become awakened without any desire or previous training whatsoever. That is what had happened to Ramana Maharishi. Without any previous training, lying down and visualizing himself as a corpse withering away, he asked the question, “Who Am I?”. But his involvement in the question was of such intensity, that within moments he came to the breakthrough and realized his Buddhahood. But a case like Ramana Maharishi is very rare. For 99 percent of individuals, what is needed is a method - not to come to one’s enlightenment, but to come to an understanding of oneself as one is. Effort is certainly needed, but it needs to be immediate, rooted in the present - not fixated upon something to attain in the future. So “enlightenment”, should not be your concern. The more you hanker after it, the more it drifts farther and farther away.
You mentioned something about kundalini. Without the help of a master, you should really avoid any of those methods which are dealing with awakening of the kundalini - particularly when they are being taught from somebody who himself is unqualified to teach. If somebody is “qualified” to teach, what is needed is not some lousy certificate from a “Yoga Teachers Training” program, which any person can go through within three months. What is needed is direct experience, and more than direct experience, maturing one’s realization. Unless one is oneself enlightened, one should have no business transmitting methods which are intended for enlightenment to others. What you said about awakening through awakening kundalini - this kundalini energy is of such an intensity - that unless your mind and body are prepared to handle such an intensity, premature awakening can only create enormous damage and a mess out of your life. That is why all of the methods which have focused on awakening the kundalini at the base of the spine, they have always stressed the importance of a gradual progression towards this, to create a situation in the mind and body where your mind and body can handle such intense energy when it awakens. Otherwise, it would be a bit like pumping 1000 volts in a machine which can only tolerate 50 volts. So don’t tamper with these processes so carelessly.