The abdomen (less formally called the belly, stomach, or tummy), in vertebrates such as mammals, constitutes the part of the body between the thorax (chest) and pelvis.
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How can I get a flat stomach?
I can do plenty of sit-ups and other ab exercises. I also have a house-mate who is a personal trainer so I know I'm doing them right.
However, I can stick to a routine of doing reasonable quantities ...
