Activity moves the bowels. If there is gas in there its gonna gurgle. Intestinal gas is removed through your blood, and expelled through your lungs. Flatulence (farting) is the leftover gas that your body couldn't get rid of the other way.
Sounds like your body is doing what it is supposed to!
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"Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind." -- Theodor Seuss Geisel
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