28. Others likewise sacrifice their essence or their austerities and their equanimous penances, while others through their concerted contemplation and intense vows offer their wisdom in sacrifice.
Bhashya :- Those who offer dravya, perform sacrifice of wealth; those who perform penance with full knowledge perform sacrifice of austerity. Such penance is oblation when it is offered in the fire of Brahman for the sake of His propitiation, the said fire becoming the sacrificial fire and offering becomes the sacrifice of wisdom.
29. Others regulate the downward breath .(apaana) to the outward breath (praana) or the outward breath (praana) to the downward breath (apaana) and restraining the process or downward breath in downward breath.
Bhashya :- Others who are devoted to the regulation of breath – प्राणायाम् offer प्राण breath in अपान downwarf breath and अपान in प्राण. In that manner they arrive at the stage of कुम्भक (restraint of the Breath).