This article, found on Science Daily, supports the benefits of daily exercise for our brain health.

Exercise Can Help Older Adults Retain Their Memories

"We all know exercise is good for us, but that still leaves plenty of questions. How much exercise? Who benefits the most? And when in our lives? New research led by University of Pittsburgh psychologists pools data from dozens of studies to answer these questions, showing that older adults may be able to prevent declines in a certain kind of memory by sticking to regular exercise."

"From our study, it seems like exercising about three times a week for at least four months is how much you need to reap the benefits in episodic memory."

Just exercising 3 times a week can help your brain.  Good to know!