"There is nothing that involves only going without returning.

It is the nature of Heaven and Earth

When there is going, there also must be returning."

"To maintain the center of the circle is to respond inexhaustibly."

Kundalini Yoga

Location Of The ChakrasThis system of Yoga is concerned with awakening of the psychic centers or chakras, which exists in every individual. (Please refer to the figure) There are six main chakras in the human beings.
The mind is made up of different subtle layers. Each of these layers progressively are associated with the higher levels of consciousness. Each of these levels are related to the different chakra or psychic center located throughout the psychic body. There are no of other chakras apart from the six main, which are associated with planes below the human level. In all we have chakras that connect us to animal levels of mind, to the instinctive realms of being or to the sublime heights of consciousness.
In Kundalini Yoga, higher-level chakras are awakened and also the activities associated with these higher psychic centers.
The basic method of awakening involves deep concentration on these chakras and forcing their arousal. Asanas, pranayama, mudra and bandha and other forms of Yoga such as Mantra Yoga are also used to stimulate the awakening.

-- Paramhansa Swami Satyananda Saraswati