Exercise has been shown to be good for the heart. New research confirms it can also benefit the brain. Aerobic exercise reversed brain shrinkage, especially of the hippocampus, a structure associated with memory. The study included 120 people between their late 50s and early 80s who were sedentary. Those randomly assigned to exercise walked 40 minutes three times a week, while the others attended attended yoga and stretching sessions. After about a year, the scientists found through magnetic resonance imaging that the hippocampus in the walkers was larger, while it had shrunk in those just doing stretching.
[PNAS , online Jan. 31, 2011]