... Aerobic exercise is good for the brain in other ways as well. For instance, it helps maintain adequate blood flow to the brain, which supplies the metabolically rapacious organ with a steady stream of oxygen and nutrients. This may be one reason why regular physical activity helps keep thinking, learning and judgment sharp as people age.
But you don’t have to wait for your AARP card to reap these rewards. Even younger adults often claim that a bike ride helps shift their thinking into high gear — and research backs them up. In one small study, healthy, young men pedaled a stationary bike at moderate intensity for 30 minutes. They also completed a series of cognitive tests before and afterward. After cycling, they scored higher on memory, reasoning and planning, and they were able to finish the tests more rapidly than before.
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