Get ready to break a sweat, Internet.
From easy stretches of the early 20th century to high-intensity Zumba, UK healthcare company Benenden Health takes you through the major fitness fads of the last 100 years in their video -- which is similar to The Cut's "100 Years of Beauty" series.
Of course, when it comes to the '80s, the best part of any work out isn't the moves, its the spandex.