Watching Dennis Gladman feeding cattle, you wouldn't know he's had Parkinson's disease for 20 years.

It's not just your car that might need a tune-up this winter. Your brain also may benefit from one, and the owners of a business called Ashland Center for Brain Harmony claim they can give you one.

In Sharon Johnson's mind, eating to improve mental function is a no-brainer.

As long as she's exercising her body, Nancy Mason figures she should exercise her mind, too.

Physical exercise isn't just good for your heart and muscles.