To quote this article which talks about 25 Scientifically Proven Ways to Make Yourself Smarter,
"Ride a motorcycle. The developer of Nintendo’s Brain Training software, Ryuta Kawashima, conducted an experiment on Japanese men in their 40s and 50s who had motorcycle licenses but hadn’t ridden in years. The men were split into two groups–one riding a motorcycle to work every day and one not. The motorcycle riders showed improved cognitive functioning and they also indicated that they made fewer mistakes at work and felt happier."
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