The latest results are uniquely beneficial because rather than focus on exercises usually done at a gym (which requires $$), the researchers studied that amount of walking, outside, each patient did. This is huge because anyone with the ability to walk, can walk outside. What they found was that walking six to nine miles a week can help reduce the likelihood of losing brain function.
I realized that this might seem a little overwhelming to some people, but when broken down over a week, is not very much. You could get this much in by walking 1 mile a day, broken into 1/2 mile in the morning and 1/2 mile in the evening. That's only a quarter mile out and quarter mile home. Easy!