Prāṇāyāma brings fitness of the mind for concentration.

patanjali-1

धारणासु च योग्यता मनसः ॥५३॥
dhāraṇāsu ca yogyatā manasaḥ

“As Prāṇāyāma dissolves the covering of the light,
fitness of the mind for concentration arises.”
Yoga Sūtra Chapter Two verse 53

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