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These days, celebrity health and fitness routines are splashed all over People magazine and social media. But even before Pilates hit Tinseltown, celebrities were using some pretty fascinating methods to stay in shape. 

In Hollywood Diet and Fitness: Vintage Secrets , Laura Slater explores the fitness and food fads of leading ladies from the 1920s through '50s. Here are some of the most fascinating regimens of Marilyn Monroe, Audrey Hepburn, and more.