Walking daily does more than make your heart healthy and trim the fats; it also spurs growth of brain tissues. The exercise helps boost nerve growth in the hippocampus, which is responsible for regulating learning and memory. The increased blood flow brought on by walking seems to boost connections between neurons and send growth signals to nerves, leading to improved memory and overall brain health.
So did you take a walk today? Your brain is younger than it was yesterday if you did. :)