I notice that when I inhale through Pingala (right nostril) while blocking Ida I am unable to do it for as long as when I inhale through Ida (left nostril).
There is a natural breath alternation between Ida (left nostril) to pingala(right nostril) every 40-60 minutes(it varies). When Ida is active one is good at actions require mind power and when pingla is active one is good at actions require physical power. Once (with regular practice of Pranayama) the Prana, Apana unites at Manipura and the nostrils start to flow equally (at least at the time of practice).
It doesnt mean that one nostril is completely blocked when the other is active, its just a partial block, and when one tries to breath thorough the partially blocked nostril may find it difficult to breath and the active nostril looks easier.
Which goes where?
Prana bounces in between Manipura and Visudhi, whereas Apana bounces in between the Mooladhara and the Manipura.
On inhale Prana moves from Manipura to Visudhi and Apana moves from Mooladhara to Manipura, on exhale it happens the other way round.
With steadfast practice of Pranayama this usual flows gets to change and the Prana-Apana union takes place at the Manipura, the energy center of the whole system, generates vital energy helps the Sushumna come alive, leads to higher awakening.
This union makes the whole system balanced as the energy is sufficiently supplied to all 72,000 Nadis.
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