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Cupping
I have remedial sports massages once a month and have had the 'cupping' thing done a couple times. If I had particularly sore spots on my back or shoulders from lifting that week, sometimes they would use the cups to further massage the area and promote blood circulation to the area. So, from my very basic knowledge, the cupping you saw on Phelps was probably to relieve some muscle soreness that resulted from training in the lead up to the Olympics.
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