Hey Ritu,
Sitkari yoga is considered to be one of the best yoga to cool down the body heat.
1. Beginners can start with deep breathing practice in sitting position (Padmasana - Lotus, Swastikasana- Auspicious, Vajrasana - Thunderbolt, Any Cross legged position in which the body can be relaxed and spine is erect.
2. Then start inhaling through mouth by rolling the tongue, make sure that the air passing in is cooled via tongue.
3. Initially 4 seconds inhale through mouth while rolling the tongue and exhale for 6 seconds through both nostrils, this can be practiced for about 5 minutes.
4. With practice one can increase the counts to 4:8, or 5:10 or 6:12 seconds
Precautions for this Yoga:
#If you have Low Blood pressure then this pranayama can bring it further down. So you must be careful.
#You may feel little cold or tingling sensation in the throat due to cold air but this is normal.
#Under No circumstances the proportion of the breathing should be forced.
#If you feel dizzy then please stop the practice and continue normal breathing.