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.
membawa udara keluar-masuk dengan mengembungkan dan mengerutkan rongga tulang rusuk; jika saya mengikat sabuk pernapasan di dada Anda, perhatikan gerakannya, maka pergerakan sinusoidal akan terjadi, yakni pernapasan. Anda semua sedang melakukannya.