प्रच्छर्दनविधारणाभ्यां वा प्राणस्य ॥३४॥
pracchardana-vidhāraṇa-ābhyāṁ vā prāṇasya ||34||

[RS] 1.34 The goal can be attained through breathing exercises involving holding your breath before exhaling.

[JW] 1.34 Or [he gains stability] by expulsion and retention of breath.

[SS] 1.34 Or that calm is retained by the controlled exhalation or retention of the breath. [p57]

[TD] 1.34 The practice of breathing exercises involving extended exhalation might be helpful. [p159]

[EB] 1.34 Or [stability of mind is gained] by exhaling and retaining the breath. [p131]

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(प्रच्छर्दन, pracchardana) = exhale; discharge; eject
(विधारण, vidhāraṇa) = hold in; hold back
(आभ्य, ābhya) = both, and
(वा, vā) = or (The state of yoga can also be reached by...)
(प्राणस्य, prāṇasya) = breath or prana; vital energy