Absolutely! There is more and more research coming out in this field, showing that regular exercise can prevent cognitive decline, as well as improve memory in populations with and without memory loss. Here is a recent article describing some of the current research from UC Irvine:

http://news.uci.edu/press-releases/brief-exercise-immediately-enhances-memory-uci-study-finds/

At Living With Care, we are passionate about providing individualized treatment plans for your loved one, which very frequently involves a home exercise program.