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What is cupping? Controversial therapy grabs headlines in Rio

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When Michael Phelps captured gold in the 4×100-meter freestyle relay, he became the most decorated Olympian of all time. However, he is also causing some commotion because of huge dark red circular marks on his right shoulder. The bruises are the result a trendy healing and recovery method for athletes: cupping therapy.

Cupping therapy treatment creates hyper-localized suction on an athlete’s body. The hope is to help mobilize blood flow, drawing more blood to over-used muscles to help relieve muscle pain and promote faster healing.