english: 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.
non_english: da biste udisali i izdisali  vazduh iz pluća kroz širenje i grčenje grudnog koša i ako bih stavila traku oko spoljašnjeg dela vaših grudi, tzv. disajnu traku i samo posmatrala vaše pokrete, videli biste prilično blag  sinusoidni pokret. To je disanje.