Mental, Physical Challenges May Help Seniors Stay Sharp, Study Says

... say. Previous studies have shown that three 30-minute sessions several times a week of brisk walking or weight training has measurable benefits on thinking and memory, Gandy said. "It is now possible to reduce physical exercise to a prescription, ...

http://news.health.com/2013/04/01/mental-physical-challenges-may-help-seniors-stay-sharp-study-says/