Maybe you heard about it from Jessica Alba, or saw an Instagram on Kim K.'s profile. Whatever your entree to waist training, you've probably wondered how it works, and if it actually works. Inquiring minds want to know, so we spoke to waist training expert and author of the best-selling book Waist Training 101: A Guide to Using Corsets to Slim Your Waistline ($13), Vanna B., for the skinny on the method. Keep scrolling to read all about it!