Your ribcage placement gives a good indication of the engagement of your abdominals. The abdominal wall is attached to the bottom ribs. Keeping the abdominal muscles engaged helps prevent the ribs from “popping up”. What is “popping up”? Well, your back arches, or extends, more than normal and as a result your ribs “pop up” or “out” more than normal, depending on whether you are seated or lying supine, that is face up.
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