Kundalini is a dormant energy within most people.
In Hindu mythology, Kundalini is a serpent goddess who lies asleep at the base of the spine, coiled three and a half times around the first chakra.
Under certain circumstances, the Kundalini energy awakens and begins to rise through the body, piercing and opening the chakras. As Kundalini releases stored and blocked energies, the movement can be quite intense, sometimes painful, and often leads to mental states that seem out of this world.
Circumstances that stimulate Kundalini awakening are many and varied, but are usually triggered by such things such as extended periods of meditation, yoga, fasting, stress, trauma, psychedelic drugs, or near death experiences.
Kundalini is a condensed, primal force, similar to the potential energy found in water. When released, it creates a vertical connection between the chakras by opening the subtle channels known as nadi, most specifically, the central channel that moves up the spine called sushumna. If we put water through a small hose at very high pressure, the end of the hose will undulate like a snake. Similarly, the intense energy of Kundalini undulates in the body as it rises through the chakras. Read more of this post