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What Are Those Strange Spots on Olympic Athletes?

If you watched American swimmer Michael Phelps take the starting block in Sunday’s men’s 4x100 freestyle relay, you may have noticed several circular marks on his torso. Other athletes have posted photos on social media of themselves with similar markings. Turns out the circles are caused by a technique called cupping, which entails having small cups placed on their skin. A pump sucks the air out creating enough suction to pull the skin into the cup, causing the...

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