For years, scientists knew exercise was good for the brain. Now they finally know why.

A brief bout of physical exercise can create "ripples" of activity in your brain that help you store and retrieve memories.

A brief period of exercise may do more for your brain than you expect. New research led by the University of Iowa shows that even a single workout can rapidly shift how your brain processes memory.

Even more reason to schedule that early-morning workout ...

Yes, that's why you can regain lost muscles much faster after a period of inactivity if you've exercised before.