The diaphragm does most of the work during inhalation – but people can use “accessory muscles of breathing” to breathe. Additionally, one can breathe and keep their stomach still, implying that muscles other than the diaphragm are causing the chest to expand. How does that work??
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You have muscles between your ribs. When inhaling they move your ribcage in a way that inflate your lungs. The magical thing is that if you expand a volume more air will rush in to compensate for pressure, thus the air filling your lungs. On the other way when you exhale the ribcage press the lungs so the air comes out
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