Kundalini

Kundalini (Sanskrit kuṇḍalinī, कुण्डलिनी,  pronunciation , "coiled one"), in yogic theory, is a primal energy, or shakti, located at the base of the spine. Different spiritual traditions teach methods of "awakening" kundalini for the purpose of reaching spiritual enlightenment. Kundalini is described as lying "coiled" at the base of the spine, represented as either a goddess or sleeping serpent waiting to be awakened. In modern commentaries, Kundalini has been called an unconscious, instinctive or libidinal force, or "mother energy or intelligence of complete maturation".

Kundalini awakening is said to result in deep meditation, enlightenment and bliss. This awakening involves the Kundalini physically moving up the central channel to reach within the Sahasrara Chakra at the top of the head. Many systems of yoga focus on the awakening of Kundalini through meditation, pranayama breathing, the practice of asana and chanting of mantras. In physical terms, one commonly reports the Kundalini experience to be a feeling of electric current running along the spine.

https://en.wikipedia.org/wiki/Kundalini