If you're looking for the fountain of youth, you might find it at the Spring Valley YMCA pool in Royersford, Pennsylvania.

Meet Joann Arnold. She's 89 years old and teaches nine classes a week at two different YMCAs.

"It keeps me active. It gives me something to do," Arnold said.

A former Naval Air reservist, Arnold has never been one to sit around, but fitness actually came into her life for a very practical reason.

"I was born chubby, so as soon as I could exercise, I did. I went to calisthenics classes, I learned to ride a bicycle, I roller-skated," Arnold said.

CBS News Philadelphia

Now, she's eager to get her workouts in, knowing the work pays off.

"I enjoy being with people, and if you're not physically fit, you're not able to engage in activities," Arnold said.

And to get to

See Full Page