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.
Koristimo međurebrene mišiće, mišiće između rebara kako bi zrak ušao i izašao iz pluća proširivanjem i skupljanjem prsnog koša. Da stavim remen  oko vanjskog dijela vaših prsa, remen za disanje, i promatrala taj pokret, vidjeli biste lagani  sinusni pokret - disanje.