Lets first understand the basic principle of kapalbhati pranayama.
- In this pranayama, there is active and forceful exhalation (breathing out) and passive inhalation (breathing in). This means that we consciously breathe out repeatedly without bothering about inhalations. Passive inhalation means breathing in, without any conscious effort and which is automatic. Remember, exhalation and inhalation are done through nostrils.
- Another point that we need to understand is that exhalation is done in synchronisation with the abdominal movements. This means that as you exhale, you should pull your abdomen inward (use your abdominal muscles). So, because the inhalation is passive, abdomen returns to its position automatically after each exhalation.
Our normal breathing pattern is first inhale and then exhale. So, basically, you reverse your normal breathing pattern during kapalbhati. You consciously exhale as I discussed above and your body automatically inhales. This is one stroke.
At the age of 45, if you are beginner, and do not have any other complications like high blood pressure, cardiac problem, long term diabetes, nor any spinal injury or spondylitis, you just sit keeping your spine straight and do kapalbhati with 20-30 strokes in one round in the beginning. After every round, you will feel automatic suspension of breathing for a while. So, take rest either sitting or lying on the ground in shavasana for one minute, then make another round with 20-30 strokes and then take rest and enjoy a deep state of silence, deep rest and freshness. How many exact number of strokes you should practice per round depends on your capacity? So, every time you do any physical exercise or breathing exercise, always do it within your limit. 5 rounds are enough to start with.
After few weeks of practice, slowly you can increase the speed and number of exhalations to about 30 to 60 per round and even beyond 60 to 120, depending on your capacity. Similarly, the number of rounds can also be increased after a prolonged regular practice.
But if you suffer from any chronic disease which generally happens - diabetes, hypertension, cardiac, lower back, spondyitis, abdominal surgery - at this age of 45, you should consider precautions and never do any excess. You should practice kapalbhati moderately. Women should avoid practice of kapalbhati during menstrual period.
But be aware that these exhalations should be regular and smooth without any jerky breaths and movements.
You should continue the practice until you feel fatigued or discomfort in the abdomen or back. Stay within your limits. Avoid overdoing to prevent injury. Always practice in a non-competitive and calm mood. See my video on preventing injury by staying within your limits.
https://www.youtube.com/watch?v=EZ-guXACgcM
Although one time practice per day is sufficient, you can practice two times (one in the morning and one in the evening) normally. Please ensure that this should be done on empty stomach and within your limits.
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