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The circular marks on Michael Phelps' shoulders are caused by a therapy technique called cupping. Cupping is believed to help with muscle recovery and pain relief by increasing blood flow to the muscles. The marks are a temporary side effect of the treatment and have become a recognizable symbol of Phelps' dedication to his training and recovery routine.
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Earn +20 ptsQ: What is the significance of the circular marks on Michael Phelps' shoulders?
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