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मेदश्लेष्माधिकः पूर्वं षट्कर्माणि समाचरेत् । अन्यस्तु नाचरेत्तानि दोषाणां समभावतः ॥२:२१॥
Medashleshmaadhikaha poorvam shatkarmaani samaacharet. Anyastu naacharettaani doshaanaam samabhaavataha.
When fat or mucus is excessive, the shatkarmas or six cleansing techniques should be practised before (pranayama). Others, in whom the doshas (i.e. phlegm, wind and bile) are balanced, need not do them.
Hatha Yoga Pradipika (2:21)
