Exercise has been found to improve cognition, research has shown, although
it is not known why. Aerobic exercise, such as walking or swimming, has
been found to be particularly effective at making the brain think better.
It is thought that exercise increases blood flow to the brain, making it
easier to think more clearly, because of the additional oxygen the brain is
receiving. Exercise also is thought to activate the hippocampus, an area of
the brain that contributes to memory and learning. Some scientists believe
that having exercise improve cognition might have developed in early humans
to help them react more quickly while running for survival.
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