Can't remember the name off the top of your head, it's the abdominal cavity and the thoracic (chest cavity) any way the bottom of the chest cavity works with the top of your abdominal cavity so when you cough and use your intercostal muscles and diaphragm I suppose you use your abs to a small degree...
Must of been some cough though, or your abs weren't very developed back then, probably both...![]()
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