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1. Take a walk
"Aerobic exercise is the number one thing you can do to improve memory," says Cynthia R. Green, Ph.D., co-author of Brainpower Game Plan. "Numerous studies show that getting your heart rate up benefits brain health and increases attention span." Even if your schedule is packed, take a brisk walk with a friend instead of chatting on the phone. Or walk to the store instead of driving.