You already have a natural waist trainer: your core.
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Whenever I wear a waist trainer, all my back fat kind of rolls up on the top of it. What should I do to combat this? - Quora
How to Lace Your Corset – Violet Vixen
Waist trainers: What happens when you uncinch? - Harvard Health
How long will it take to shape a waist permanently using a corset? - Quora
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