Doing research on fear and anxiety moderation…SharpBrains.com has an article called Can you Grow Your Hippocamus?
“Other studies have shown that people who exercise regularly and are physically fit have a much bigger hippocampus. The more you walk, the bigger your hippocampus will get and the less would be your risk for developing Alzheimer’s disease. One study showed that walking one mile a day lowers the risk of Alzheimer’s disease by 48%.”