At the 2016 Rio Olympics, the world wasn't just watching Michael Phelps rack up gold medals. People were fascinated by the distinctive circular red marks dotting his shoulders and back. These were the telltale signs of cupping therapy.World-Class Athletes Who Swear By ItMichael Phelps - The Swimming Legend's Secret Weapon The 23-time Olympic gold medalist is cupping therapy's most famous advocat..
