Our expert says:
Fiona, I doubt that it has something to do with his colon. It might be that he’s just unfit or that he is swallowing air due to some other reason. It might also be that he has a hiatus hernia, but then one would expect symptoms not just after exercise. The best would probably be to let your doctor have a look and if he can’t find anything wrong, to see a gastroenterologist. Good luck.
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