Wearing a Waist Training corset, like contraption (like corsets from the 1500s) to cinch your hips, core, and back. The idea is to wear it for a certain amount of time every day, and eventually, your body “molds” itself into a slimmer figure. Sounds easy enough—Jessica Alba told Net-a-Porter she used this to lose the baby weight and Khloé and Kim Kardashian, Kylie Jenner, and Amber Rose have posted selfies sporting the waist-cinching tool: