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How fitness in America went from a circus act to a national obsession

Natalia Mehlman Petrzela is an historian by trade — and a gym rat by choice. 

In her new book, she combines those loves. "Fit Nation: The Gains and Pains of America's Exercise Obsession" traces the history of fitness in the Unites State, from a time when it was considered part of a circus act to today, where it’s a national obsession. 

Petrzela talked about how her love of fitness later in life. 

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Lauren Gilger, host of KJZZ's The Show, is an award-winning journalist whose work has impacted communities large and small, exposing injustices and giving a voice to the voiceless and marginalized.