This is a great article regarding running.  I have always said I do my best thinking while running.  The article talks about other endurance sport activities – biking and swimming – which also work for me but not as well.  Why? I speculate that the brain needs to compute a number of other factors with biking and swimming that deal with personal safety – so that has the potential to cloud thinking.  Anyways, focus on an issue, and run! Run until you solve it.  Forest Gump did.