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http://qz.com/592569/a-neuroscienti...benefit-to-exercise-that-is-rarely-discussed/
Studies in rodents demonstrated that increased levels of physical exercise can result in improved memory by enhancing both the birth rate and the survival of new hippocampal brain cells. Exercise encourages the long-term growth of hippocampal cells by immediately increasing levels of a key growth factor in the hippocampus called Brain Derived Neurotrophic Factor (BDNF. Now, when I exercise, I imagine BDNF levels surging in my hippocampi, encouraging all those new hippocampal cells to grow.