Christopher Scott "Chris" Kyle was a United States Navy SEAL veteran and sniper. Kyle served four tours in the Iraq War and was awarded several commendations for acts of heroism and meritorious service in combat. source
When I run, I think about everything: physics, family problems, plans for the weekend. I haven't made any big discoveries on a run, but it does give me time to think through problems. Some solutions are obvious, but they are only obvious when you are relaxed enough to find them.