So you use the intercostal muscles, the muscles between your ribs, to bring air in and out of your lungs just by expanding and contracting your ribcage, and if I was to put a strap  around the outside of your chest called a breath belt, and just look  at that movement, you see a rather gentle sinusoidal movement, so that's breathing.
să băgaţi şi să scoateţi aer din plămâni, mărind şi micşorând cutia toracică. Dacă v-aş pune o centură de respiraţie în jurul pieptului, am observa o mişcare lină, sinusoidală; asta e respiraţia. Toţi facem asta.