Those shatkarma which effect purification of the body are secret. They have manifold, wondrous results and are held in high esteem by eminent yogis.
(Hatha Yoga Pradipika 2:23)
1. Neti: nasal cleaning, including jala neti and sutra neti.
2. Dhauti: cleansing of the digestive tract.
3. Nauli: abdominal massage.
4. Basti: colon cleaning.
5. Kapalbhati: purification and vitalisation of the frontal lobes.
6. Trataka: blinkless gazing.