Subject:Slight upset stomach always around 45 min into run?
OK so any ideas if something happens in the body around the 45min Marx of running? I've ran up to 1\2 marathon in 1:30. But any time I go out for an 1hr or more run I tend to have a little bit of an upset stomach feeling around the 45min mark or after finishing the run. It didn't stop me from running but its aso not a good feeling. Any ideas what it could be? Love to find a work around to this.