Bhashya
न केवल वागाद्यभिव्याहरणमेव, अत अस्मात् अन्या-न्यपि यानि वीर्यवन्ति कर्माणि प्रयत्नाधिक्यनिर्वर्त्यानि-यथा अग्नेर्मन्थनम्, आजे मर्यादाया सरण धावनम्,दृढस्य धनुष आयमनम् आकर्षणम्- अप्राणन्नपानस्तानिकरोति, अतो विशिष्ट व्यान प्राणादिवृत्तिभ्य ।विशिष्ट-स्योपासन ज्याय, फलवत्त्वाद्राजोपासनवत् ।एतस्य हेतोएतस्मात्कारणात् व्यानमेवोद्गीथमुपासीत, नान्यद्वृत्त्यन्तरम् ।कर्मवीर्यवत्तरत्व फलम् ॥
In plain words
It is not merely the articulation of speech and other senses. Consider other vigorous deeds requiring immense exertion—such as churning fire, sprinting toward the finish line, or drawing a stiff bow—which one performs without ordinary breathing through the force of apāna. Therefore, vyāna stands superior to prāṇa and the other vital functions. Meditating on this superior force yields greater rewards, much like worshipping a king. For this very reason, you should contemplate vyāna alone as the udgītha, and no other breath function. The reward is the heightened potency of your actions.
Close to the Sanskrit
Not merely the utterance of speech and others; hence from this other powerful actions also which are accomplished by excess of effort—such as the churning of fire, running in a race for the boundary, drawing and pulling of a stiff bow—without breathing one does apāna does them; hence vyāna is superior to the breath functions like prāṇa. The meditation of the superior one is greater, because of bearing fruit, like the meditation on a king. For this reason, from this cause, one should meditate on vyāna alone as the udgītha, not another function. The fruit is the greater vigor of action.