We're in the business of finding cool people doing remarkable things. Or remarkable people doing cool things. Dr. Lucky Meisenheimer is both.

We dig masters swimming. Men and women of all ages compete with those of equal ability but against those in their own age group. Dive into this story and discover why it's quickly becoming one of the world's great intergenerational activities.

Why is triathlon one of the fastest growing sports in the U.S.? And why is the 40-plus crowd the fastest-growing segment? See how addictive changing your life can be.