Do you breath through your stomache or chest?

I don't believe the statement that "most people" breathe through their chest. Who determined this and how? How would you find out how "most people" breathe? Years ago, in connection with martial arts and Eastern medicine, I read the claim that Westerners breath in a shallow way so that only the chest rises and falls, whereas Easterners naturally breathe through the abdomen, indicating a fuller and more healthy breath. I just don't see how such a generalization can be made. However, it may be true that some people naturally breathe more deeply than others. It's easy to learn the more healthy abdominal breathing. I think when people are anxious they tend to breathe in a more shallow way--don't people always say to take a deep breath when you are nervous?

IDK where all this nonsense comes from. There's no such thing as breathing through the abdomen etc. Just some hippy nonsense. There are several muscles involved with breathing. The diaphragm is the primary one and the intercostals help along. When people are in respiratory distress or breathing heavily for other reasons [like exercise] other accessory muscles will be subconsciously recruited to help increase tidal volume or overcome airway resistance. They do this by further expanding the thoracic cavity, which pulls on the pleura and draws greater vacuum.