It's actually quite simple. I just learned it from a beautiful woman. Prepare a sand scraping board, apply emulsion to the waist for lubrication, and then scrape it from top to bottom, from left to right for ten times, and then from right to left for ten times. Do several groups every day, and finally do it between meals, which has the effects of slimming waist, improving constipation and increasing intestinal peristalsis.