This doesn't surprise me as those of us in the bodybuilding and fitness field know the power of exercise and it's interactions in the body and of the genome to express to health and longevity. Just ask Jack Lalanne who at 94 still worksout 6 days a week.
However i always like to post articles from different sources when i see clinical studies showing the benefits as many out there are clueless like i was at one time.
Fitness and the Brain: Can a Walk a Day Keep Alzheimer's Away? - Scientific American