I think anyone who is an athlete would make the argument, completely blind, that their focus on physical activity makes them smarter, as well as function more highly in other areas of their life. Personally, even after an exhausting 20 miler I can’t help but be a machine. After running for hours the next thing on my mind is to conquer whatever’s next, be it the day’s errands, cleaning, reading, or all of the above, and as quickly as possible!
Well, now it’s proven.
Read it. And then go out for a swim/bike/run.