Nyad and her partner, Bonnie Stoll, launched EverWalk, a long-distance walking movement designed to get Americans off their couches and onto the street.
"We, the human race, walked from Africa to Europe. So if you go all around the world, people walk — and Americans don't," she said. "The thrust of EverWalk Nation is to turn our country into a nation of walkers."
The EPIC Walks, as they're called, often cross several states and hundreds of miles, encouraging walking as a way of life.
The latest one, the Liberty Walk, started in Philadelphia Monday. About 60 people are walking the 134-mile trek from Philly to Washington, D.C., over the course of seven days. They cover roughly 20 miles a day.
Patti Sears from California is walking her third EPIC.
"It's not a race," she said. "It's a chance to get out there and see the scenery, see the sites, and walk and talk and meet people from all over."
Nyad echoed Sears, adding that it's all about endurance and self-exploration.
"A lot of people are about my age. I just turned 70, and that group — if you look around, some younger, some right on my age, some a little older, very few very young," she said. "We are at a state of life of contemplating: What is it all about and how much time do we have left? And we better get going doing it."
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In Philadelphia, walkers stopped at landmark sites like the Independence Seaport Museum and Delaware River, Christ Church, Betsy Ross House, Ben Franklin's grave and printing house, Liberty Bell, Independence Hall, Chinatown Friendship Arch, City Hall, LOVE Park, the Rocky statue and steps, Philadelphia Museum of Art, Schuylkill River Trail, Boathouse Row, Fairmount Water Works, University City, Rittenhouse Square, Society Hill, and Headhouse Square.
Previous EPIC Walks have spanned routes from Los Angeles to San Diego; Boston to Cape Elizabeth, Maine; and Vancouver, Canada, to Seattle.