HYP chapter 2 states initially that pranayama follows shatkarma, asana and diet. Those techniques must be in place before it makes sense to practise pranayama. In this chapter it seems that asana has the role of preparing the nadis and chakras of the prana kosha/ body for the more intensive work ofpranayama. When this is accomplished, the main function of pranayama is to cleanse’ the nadis of the subtle body.
HYP states that the pranayama technique of nadi shodhana (alternating breathing through left and right nostril) leads to the purification’ of nadis and chakras. Later on it looks at eight additional pranayama techniques – the 8 kumbhakas; the breath retentions. Some of the kumbhaka techniques are to be used in combination with special locking techniques – the bandhas.
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