You don't simply tell someone to get out there and win the tennis match. You say 'move your feet' or 'watch the fuzz on the ball' to really get into the Zen of it. You pull all that together, and then you just might hold up the Wimbledon Plate... It's not about winning first place but bringing every element of effort to whatever you do.

Swimming is probably the ultimate of burnout sports. It's ironic because millions of people who swim as their regular exercise love the meditation aspect of it; you don't wind up with any orthopedic injuries. But when you swim at a world class level for hours and hours - the loneness of the long distance runner.

But for each of us, isn't life about determining your own finish line?

When I walk up on that shore in Florida, I want millions of those AARP sisters and brothers to look at me and say, 'I'm going to go write that novel I thought it was too late to do. I'm going to go work in Africa on that farm that those people need help at. I'm going to adopt a child. It's not too late, I can still live my dreams.'

You have a dream 35 years ago - doesn't come to fruition, but you move on with life. But it's somewhere back there. Then you turn 60, and your mom just dies, and you're looking for something. And the dream comes waking out of your imagination.

I think 60 is when many people hit their prime. We elect many of our presidents in their 60s. At that age, people are full of ideas and their best self. I wanted to dig into my potential and bring out my best self.

I don't want to be the crazy woman who does it for years and years and years, and tries and fails and tries and fails and tries and fails, but I can swim from Cuba to Florida, and I will swim from Cuba to Florida.

The most venomous animal that lives in the ocean is the box jellyfish. And every one of those barbs is sending that venom into this central nervous system. So first I feel like boiling hot oil I've been dipped in. And I'm yelling out, 'Fire! Fire! Fire! Fire! Help me! Somebody help me!' And the next thing is paralysis.

About the 50th hour, I was going to start thinking about the edge of the universe. Is there an edge? Is this an envelope we're living inside of, or no, does it go onto infinity in both time and space? And there's nothing like swimming for 50 hours in the ocean that gets you thinking about things like this.

In swimming, especially training out in the ocean and open water, you got fogged-over goggles, you're stuck with your own thoughts - there's great benefits to that, deep thinking like that after many hours, but there's also tremendous loneliness. You burn out. You want to run, jump, ski, do anything. So at age 30, I was finished.

The highs were high, the awe, I'm not a religious person, but I'll tell you, to be in the azure blue of the Gulf Stream as if, as you're breathing, you're looking down miles and miles and miles, to feel the majesty of this blue planet we live on, it's awe-inspiring.