When the breath becomes still
Bahya Abhyanthara Vishaya Aakshepi Chaturthaha|
This is the fourth type of Pranayama where the outgoing breath is not holding on to any thought or object outside and the incoming breath is not holding on to any ideas inside. The flow of the breath in and out hence becomes very smooth and takes the mind to a transcendental state of existence. - Swahilya Shambhavi.
