you may notice them on michael phelps. it's the thing of cupping and it's suggestion that eases muscle pain. nbc10 says that the olympic athletes maybe starting a cupping craze. >> michael phelps is sporting more than gold medals. one cannot help but notice the blotches and it's bringing aware of cupping. >> it's the cupping and form of expression. >> it's holistic medicine and he says that he expects it to catch on more p as it's getting more attention on the olympic stage. >> hollywood types are into it. here is one after cupping therapy. they show how simple the process is. he says that suggestion from blas tick cups loosens muscle and improves the blood flow. >> all muscles become soft,