Kirya Yoga
Kirya yoga is aimed at slowly bringing up the kundalini energy within the nervous system and activating it, unlike kundalini yoga facilitating a lighter yoga to awakening the kundalini.
Kundalini is an energy within the nervous system which lies at the base of the spine. This energy, whatever it's origin, as many speculate that it is the next phase of human evolution, allows one to, when activated, experience more energy, which can be used.
This requires, however, that one's heart chakra, one's heart, is active at least 51%, or higher, depending on how intense the demand will be on kundalini.
Any kind of kundalini awakening begins with the heart chakra sending a signal to the base of the spine, to the kundalini gland, from where kundalini, which is related to sexual energy, rises to the crown and into the brain, filling the brain with energy and allowing for states of bliss.
For one to know if you are experiencing a kundalini awakening, a kundalini awakening feels like being one with everything around you and not needing to think about anything or being interested, usually, though being able to. It is a state of total peace and equanimity, or, alternatively, if you feel a lot happier than usually, thtat would also consitute as - well, in the literature, this wouldn't exactly be called a kundalini awakening, but an inner conjunction, where the energy of "Shakti" at the base of the spine rises to meet her lover "Shiva" at the third eye. They conjunct. It is part of a kundalini awakening.