Here are some expressions commonly used in discussing the body - the trunk or torso matters.
back - the posterior part of a human (or animal) body from the neck to the end of the spine chest - the part of the human body between the neck and the diaphragm or the corresponding part in other vertebrates, thorax stomach - an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion waist - the narrowing of the body between the ribs and hips
Now we put new vocabulary into context, so you can see how you might use these terms yourself. The expressions are in boldface in the text.
Chest pain can be frightening, but it doesn´t always indicate a heart attack. You can minimize problems with back pain with exercises that make the muscles in your back, stomach and hips strong and flexible. Nancy has got an upset stomach. The size of your waist in relation to the size of your hips can help determine your risk for heart disease, stroke, diabetes, and other conditions.