Double Abdominal Belt stimulates thermal activity in your core which increases perspiration, allowing toxins to escape. For optimal results, waist training works best as a part of a healthy lifestyle, that includes eating what is right and exercise 4-5 times a week. Waist Training works in several ways. First, it slims your waistline by as much as 2-3 inches as soon as you put it on. But also, it helps stimulate heat in your core, which makes you perspire more around your midsection.