I joined Lumosity this year--the web site that has exercises and games designed to strengthen your brain (based upon the latest neuroscience research). I'm at the age (and with some family history) where I'm thinking more about how to be intentional about how my brain functions best and how to keep it operating at maximum efficiency and effectiveness.  As I perform these exercises regularly, I am actually charting my improvement in memory, problem-solving, speed, attention, flexibility.  It's been fun and rewarding.