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For some time, researchers have known that exercise changes the structure of the brain and affects thinking.
Ten years ago scientists at the Salk Institute in California published the groundbreaking finding that exercise stimulates the creation of new brain cells. But fundamental questions remain, like whether exercise must be strenuous to be beneficial. Should it be aerobic? What about weight lifting? And are the cognitive improvements permanent or fleeting?
The answers to these questions can be found in the NY Times article, "Phys Ed: What Sort of Exercise Can Make You Smarter?" By Gretchen Reynold