Now, the 2024 Paris Olympics is on. From some news photos, many swimmers have black circles on their bare backs. Those are cuppings, the "imprints" out of the traditional cupping therapy. Previously, they were only on the backs of Chinese athletes, but now they are widely seen on other athletes from different countries. Please see the following report.

What is cupping? Explaining the circles on swimmers bodies at the 2024 Olympics (msn.com)