Basti
This practice is for the purpose of cleaning the bowels. Traditionally a small piece of bamboo was used to draw water into the colon by getting into a lake or deep enough river and contract the abdominal muscles, then the water is expelled through the anus, cleaning particles that might have been stuck to the interior wall of the large intestine. Today this practice is known as an enema and is very easy to get an enema kit.
Other technique in Yoga to clean the intestines is called Sankha Prakshalana and involves drinking about five liters of slightly warm salty water. The salty water does not get absorbed by the intestine. Instead it pulls out waste and toxins from the intestinal walls and throws it out through the anus.
A common practice today is to do the smaller version of Shanka Prakshalana called Laghu Shanka Prakshalana where only two liters of salt water is used. One has to go to the toilet three - five times until plain water comes out of the rectum. This gives a complete cleaning of the intestinal tract.
Practice - Variation 1 water Yogic enema
Practice - Variation 2 Sthal Basti meaning dry Yogic enema
Practice - Variation 3 Mula Shodhana meaning anal cleansing
The six cleansing actions are intended to be the start of a Yoga practice in order to clean, strengthen, remove toxins and improve the flow of Prana through out the practitioner.
Yoga poses help to elongate and strengthen the muscles of the body as well as to calm the mind for the deeper spiritual practices of Yoga.
Breathing exercises are a great practice to remove carbon dioxide, increase lung capacity as well as being a good preparatory practice for the deepest spiritual practice of Yoga, Meditation.
The four body locks that makes up this practice give the practitioner the ability to hold or lock Prana in certain locations of the body. These practices also allow the practitioner to release blockages that may be holding the practitioner back.
The gestures in this practice include the whole body and are intended to awaken Prana, Chakras as well as Kundalini energy within the practitioner.
Meditation is the highest spiritual practice of Yoga which is why this practice is the most difficult practice to preform, but with correct knowledge and dedication, can be the most profound practice of Yoga.