But we've become a nation that isn't very good at producing world-class athletes anymore.

How can something so scary happen to a world-class athlete?

While doing the thing that makes him a world-class athlete.

But not before world-class athletes and artists had begun talking about "the zone," the period of performance when time seems to stand still.

So did and probably still do most world-class athletes.

This is his 17th year as a world-class athlete, and illness has slowed him for weeks.

But world-class athletes - if they take the drugs - are not alone.

The same sleep strategies used by world-class athletes are also good for regular folks.

Today's world-class athlete no longer needs to have a full-time job to support his or her athletics.

Along with training and performing to be a world-class athlete comes the pain of injuries.