According to Osho, even with vigorous, deep breathing the body cannot absorb 'extra' oxygen at will. Only a limited portion of the lung’s thousands of pores actually receive oxygen—about one to one‑and‑a‑half thousand in a healthy person. The remaining pores stay inactive reserves, so overbreathing doesn’t meaningfully increase uptake; the system self-regulates and takes only what’s required.
Breathing extra hard doesn’t stuff your whole lungs with more oxygen—your body only opens some air pockets and uses what it needs.