Take a look back at the last hundred years of exercise trends, from the invention of treadmills in the 1920s, to the rise in popularity of Pilates in the 1960s, to the aerobic craze of the 1980s. Still haven’t subscribed to Allure on YouTube? ►► bit.ly/AllureYouTubeSub ABOUT ALLURE The best daily makeup tips, skin-care advice, hair tutorials, product reviews, and videos from beauty experts. 100 Years of Exercise | Allure