This is a common response to people showing off a freshly-"cupped" back. Cupping is a Chinese medicine technique in which suction cups are placed on the skin to mobilize blood flow, reduce pain, and promote healing. Even though cupping has been practiced in ancient Egypt and in China since 1000BC, most Americans first learned about it while watching the 2008 Summer Olympics, noting the large circular marks on the backs of Chinese swimmers. (And for us USWeekly readers, we le