Pilates has been around since Joseph and Clara Pilates began teaching the method in New York in 1926, but it wasn't popularized until stars like Madonna and Gwyneth Paltrow started doing it in the early 2000s. And then it was everywhere. But almost as quickly as the movement gained traction, it faded again and was declared dead in 2015. 

Eight years later, it's back and more popular than ever with nearly 6 million Americans regularly practicing Pilates today. And once again, A-listers like Jennifer Aniston, Kendall Jenner and even Meghan, Duchess of Sussex, are getting in on the action. 

What is Pilates? 
Pilates is a nearly 100-year-old workout initially developed by Joseph and Clara as a method of rehabilitating injured dancers and soldiers.