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RIO DE JANEIRO, BRAZIL - AUGUST 14:  Gold medalists Elena Vesnina and Ekaterina Makarova of Russia pose on the podium during the ceremony for the women's doubles on Day 9 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 14, 2016 in Rio de Janeiro, Brazil.  (Photo by Clive Brunskill/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 14:  Gold medalists Elena Vesnina and Ekaterina Makarova of Russia pose on the podium during the ceremony for the women's doubles on Day 9 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 14, 2016 in Rio de Janeiro, Brazil.  (Photo by Clive Brunskill/Getty Images)

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Why Olympians bite their medals

We've all seen them do it -- pose on the podium, medal between their teeth. But why? Clarissa Ward has the answer.

Why Olympians bite their medals

We've all seen them do it -- pose on the podium, medal between their teeth. But why? Clarissa Ward has the answer.