You already have a natural waist trainer: your core.
Wearing a Waist Trainer While Working Out: 6 Things to Keep in Mind
What Happens to Your Body When You Wear a Waist Trainer
Get a Kim Kardashian-style waist trainer on for less
How to Waist Train Safely & Effectively - Tips for Success
If you wear a corset and lose two inches off your waist, and then stop wearing the corset, how long will the two inches stay off (assuming you have a good diet
How much can you lose in Two weeks with a waist trainer on? - Quora
Exercising in a waist trainer will harm you before it helps you
Sleeping In a Waist Trainer: Sound Idea or NIGHTMARE?
Here's how to know what size waist trainer you need – Hourglass Express
Why So Many Are Obsessed With Waist Trainers – Body Maxx