Natalia Mehlman Petrzela is Assistant Professor of History at The New School in New York City. She is the author of Classroom Wars: Language, Sex, and the Making of Modern Political Culture (Oxford University Press, 2015), and her writing has appeared in various scholarly journals and popular media such as The New York Times, Slate, and Well+Good, where she writes a “fitness history” column. She is a host of the Past Present podcast and her new research focuses on the emergence of fitness culture in the postwar United States. She tweets from @nataliapetrzela, and you can learn more about her work at www.nataliapetrzela.com.