If there's anyone who has an incredible hourglass figure, it's Kim Kardashian. Here's the proof:
But she's revealed on Instagram that she is now waist training.
Waist training involves wearing an undergarment similar to a corset, in order to cinch in and permanently reduce the size of your waist over time.
The process involves wearing the corset for a short period of time at first, before increasing use. Some people even sleep in it.
It seems that Kim is using a fitness waist trainer, which manufacturers claim work by compressing your core and increasing perspiration.