Kriyas are a set of cleansing practices in yoga used to purify the mind and physical body.

There are six types of Yogic kriyas.
1. Kapalabhathi (cranial cleansing)
2. Trataka
3. Neti
4. Dhouthi
5. Nauli
6. Nauli

These kriyas help cleanse the body's metabolic wastes, which, at times, the body fails to eliminate naturally. According to Hatha Yoga, this cleansing can bring harmony in the energy flow and balance three doshas – Vata, Pitta and Kapha. According to Naturopathy, an imbalance in three doshas and an accumulation of toxins can cause ailments. The practice of Kriyas before pranayama thereby helps to prevent and cure diseases