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RIO DE JANEIRO, BRAZIL - AUGUST 07:  Michael Phelps of the United States reacts in the Final of the Men's 4 x 100m Freestyle Relay on Day 2 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 7, 2016 in Rio de Janeiro, Brazil.  (Photo by Ryan Pierse/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 07:  Michael Phelps of the United States reacts in the Final of the Men's 4 x 100m Freestyle Relay on Day 2 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 7, 2016 in Rio de Janeiro, Brazil.  (Photo by Ryan Pierse/Getty Images)

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    Team USA's secret Chinese therapy

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Team USA's secret Chinese therapy

Wondering why Michael Phelps and so many other athletes are covered in bright red spots? It's a 2,000-year-old technique called cupping.

Team USA's secret Chinese therapy

Wondering why Michael Phelps and so many other athletes are covered in bright red spots? It's a 2,000-year-old technique called cupping.