when you breath in you dont tense your abs, the abdominal wall has to relax otherwise the diaphragm (muscle below the lungs) cannot expand the lungs to take in air.
If your not tensing your abs and you take a shot to the gut, you have no protection in the stomach area...
There are the nerves behind the stomach and the impact causes the pressure to change in the diaphragm, which is the large muscle which divides your stomach and abdomen from your heart and lungs.
The diaphragm goes into spasm and contracts painfully, making it hard for your lungs to breathe in and out and only once the muscle stops cramping will you able to catch your breath again. :P
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