Putting aside, for the moment, the physical benefits of resistance training and endurance training, Geezer directs readers to research suggesting that light exercise, such as walking or gardening, does as much for our brains as far more strenuous routines. The Tufts Health & Nutrition Letter reports that researchers in Bologna, Italy analyzed data about the daily routines of 749 men and women, all over the age of 65. After four years of followup, the scientists found that those whose routines included moderate exercise had a much lower risk of dementia. Simply walking each day, for example was associated with a 73 percent reduction for vascular dementia.