This is pretty much what John J. Ratey, MD, author of Spark: The Revolutionary New Science of Exercise and the Brain, wrote about neurogenesis in 2008.
http://www.biosciencetechnology.com/news/2014/08/physical-fitness-makes-kids-brains-bigger?
A new study of 9- and 10-year-olds finds that those who are more aerobically fit have more fibrous and compact white-matter tracts in the brain than their peers who are less fit. “White matter” describes the bundles of axons that carry nerve signals from one brain region to another. More compact white matter is associated with faster and more efficient nerve activity.
The team reports its findings in the open-access journal Frontiers in Human Neuroscience.
“Previous studies suggest that children with higher levels of
aerobic fitness show greater brain volumes in gray-matter brain regions
important for memory and learning,” said University of Illinois
postdoctoral researcher Laura Chaddock-Heyman, who conducted the study
with kinesiology and community health professor Charles Hillman and
psychology professor and Beckman Institute director Arthur Kramer. “Now
for the first time we explored how aerobic fitness relates to white
matter in children’s brains.”
I was quite physically fit as a kid, walking and biking all over the place.
More at link.
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