Exercise And The Ever-Smarter Human Brain by Gretchen Reynolds. Well Blog. The New York Times. December 26, 2012.
Our ancestors survived by becoming endurance athletes, the ability to outlast fleeing animals being crucial in acquiring food and hence mating success and propagation of endurance qualities. Now it is increasingly thought that BDNF, or brain-derived neurotrophic factor, are important for endurance and brain size and were transmitted by the evolutionary success of endurance-oriented humans. Intelligence and movement are linked. Hence the link between exercise and brain capacity--between a healthy body and a healthy mind.
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