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The early 1900s saw a great deal of stretching as the exercise of choice, which eventually made its way into machinery. Stationary bikes, rowing machines, and the Vibro-Slim, a vibrating belt that massaged the body, were popular methods of exercise. While a machine that requires no effort but standing in place while it goes to work sounds equal parts amazing and completely nonsensical, what was more alarming was the 1920s woman's idea of activewear: dresses, high heels, and pearls.