Name a reality TV star known for her hourglass shape, and chances are, she credits a waist trainer with keeping her slim (we’re looking at you, Kardashians).
As Yahoo Health has reported before, using a waist trainer isn’t exactly risk-free. And while you may see results, experts say they won’t be long-lasting: “The corset itself doesn’t have any direct effect on your fat or anatomy,” plastic surgeon Andrew Miller, MD, previously told Yahoo Health. “If you stopped wearing a corset, eventually you’re just going to return to the way you were.”
But what happens when a group of women wear a trainer one hour a day for a full week? Watch the video above to find out.
Read This Next: Why Waist Training Is a Really, Really Bad Idea