Kaki pranayama can assist yogis in elongating their inhalation, which is helped by the pursed mouth shape. It can also assist in improving respiratory health and slowing down the breath. Some believe that regular practice of kaki pranayama can lead to a long, disease-free life.
This pranayama practice is related to the yogic gesture of kaki mudra as the lips take the same form. However, it is more closely related to the yogic breathing technique.
Finally, kaki pranayama is believed to open the anahata chakra, which is associated with relationships, love and self-acceptance.