The Kundalini awakens in the physical body in the same way that your thoughts, emotions, and impulses are experienced in the physical body. They are not quite "physical" yet have some relationship with physicality. Similarly, the Kundalini of the first initiation directly changes the physical organism, although the energy itself is not merely physical.
Are thoughts and emotions experienced in the physical body?
As I understand it, you feel via the vital body. The emotion is felt in the astral body. The thoughts are felt in the mental body. There are physical triggers but the actual "translation" and feedback are derived from the vital body's ethers. An analogy: A light switch is flipped, but the power that feeds the light bulb has nothing to do with the switch itself. A house, in and of itself, has no inherent power. It needs a connection to power lines or a generator. But the power that runs it is not of the house itself.
I guess it just seems to me that the vital kundalini would be for both the physical and the vital body. As what's good for the vital is good for the physical. The vital is the source of physical properties. You could have all the physical kundalini in the world, but without the vital body it's a dead physical body. The concept of a physical kundalini that cannot be physically examined, from my perceptive, makes it a non-physical thing. It makes it vital. Because everything else has a distinct physical representation (heart, thymus, thyroid, liver, gonads, brain, etc.).
If a person raises the physical and vital kundalini and die then would it be all for nothing? Or does the next body have these faculties already developed? We keep hearing that all this physical stuff is impermanent and illusion, but yet we have to raise the kundalini in these impermanent illusionary bodies that are going away anyway.
Regarding other planets, we scarcely understand the body, heart, and mind we use everyday. We scarcely understand the people we interact with everyday. The further from our direct experience, the less likely we are to know the facts of any given phenomenon. So, until we can know about a phenomenon directly, for ourselves, it is best to set beliefs or disbeliefs aside and deal with what is immediately practical.
So why are these planetary civilizations, Herculobus, Mu, Atlantis, fish people in our oceans, alien visitors, people being able to control nature, fly, the end of our world and all these not so immediately practical subjects brought up by Samael aun Weor? Clearly, we can't verify them by your logic (as opposed to the conventional logic) so why talk about it at all? It would seem that the only physical teachings would be self observation, self remembrance, transmutation, meditation, alchemy and maybe astral projection. And only after one is able to take practical steps to verify something is it mentioned in the internal worlds. I traveled to a temple in the astral (or so I think anyway). There were two women at the entrance. One in a white nun type over garment; the other in black. Now I have to wonder if this real or am I seeing this because my subconscious has already been told to expect this (i.e. J. & B.).
On that note, if you take it to another level there wouldn't be much to believe in. If you are driving a Prius and I tell you you're driving a BMW what would be your reaction?
You look at it and you say, "See, it's a Prius. It has the Prius logo, etc.".
I say, "No, you are only being fooled into thinking you see a Prius. It's really a BMW".
Would you honestly doubt what you see? Or rather, what reason do you have to doubt what you see? If we start down that path we must put everything in doubt. We can never be sure of anything because as long as there are bigger fish in the sea it can be said that no matter what you see or experience it could all be false. No matter how spiritual the nature of the experience, or how deeply or intimately you feel something is the Truth, it could be illusion made by something that much greater than yourself to deceive you. So the ability to verify reality becomes impossible on all levels. Because no matter what you see it could be a deception. The entire White Lodge can be a big deception. The idea of an Innermost can be a deception. Your entire concept of good or evil, karma and dharma, etc. can be deception. Anything can be a deception and therefore everything boils down to belief or disbelief. No real knowing can ever exist for us.
If a satellite can travel to Venus, park in orbit and be feed consistent false information then how do you ever verify that. Even if earthlings built a spaceship and traveled to Venus and there were people there you could just say that the people on Venus are an illusion and that it's actually barren.