Aspirants should possess all of the Sattvic qualities and be completely free of impurities.
Satsanga, seclusion, dietary restraint, good conduct, good character, Brahmacharya, Vairagya, and other aspects of Yogic life form a solid basis. For swift progress on the spiritual journey, the assistance of a Guru who has already walked the path is essential. Yoga Abhyasa must be practiced in a cool, temperate climate.
The Sukshma (astral) channels from which Prana (vital energy) flows to various parts of the body are known as Nadis. The most significant of the numerous Nadis are Ida, Pingala, and Sushumna. The Kanda is the starting point for all Nadis. Kanda is situated between the anus and the center of the reproductory gland. Sushumna Nadi is found in the spinal canal of the spinal column. A Nadi named Vajra exists within the Sushumna Nadi. Inside this Vajra Nadi is Chitra Nadi, a small canal also known as Brahmanadi. When Kundalini awakens, it travels via Chitra Nadi. This are all Sukshma centers, so no laboratory research or test-tube experiments are permitted. The gross physical body cannot survive or operate without these subtle centers.
The significant Chakras are Muladhara, Svadhishthana, Manipura, Anahata, Vishuddha, Ajna, and Sahasrara. Layer after layer of the mind opens as Kundalini moves from Chakra to Chakra, and the Sadhaka reaches higher levels of consciousness.
He gains different Siddhis at each Chakra. On the sides of the spine are Ida, Pingala, and other Nadis. Ida and Pingala circulate from the left and right nostrils, respectively. During Svara Sadhana, the air can flow through the left nostril during the day and through the right nostril at night.
You may also want to read more about Kundalini Yoga and Holistic Healing here.