Published June 1, 2017 10:50AM

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As the global Rock ‘n’ Roll Marathon Series celebrates its 20th anniversary this weekend in San Diego—the host city of the first Rock ‘n’ Roll ever!—we celebrate how a big idea transformed the face of running for the masses with music, miles and moments to remember. Check out this video commemorating the amazing story behind the series—and yes, those Elvis costumes were made just for runners!