(From L to R) Evgeniya Polyakova of Russia and her teammates Yulia Gushchina, Yuliya Chermoshanskaya and Aleksandra Fedoriva look at the scoreboard after the women's 4 x 100m relay final of the athletics competition in the National Stadium at the Beijing 2008 Olympic Games August 22, 2008. The Russian team finished first. REUTERS/Jerry Lampen (CHINA)

2016 Rio Olympics - Swimming - Victory Ceremony - Men's 200m Freestyle Victory Ceremony - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 08/08/2016. The gold medal is pictured on Sun Yang (CHN) of China. REUTERS/David Gray FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. - RTSLZ2D

2016 Rio Olympics - Sailing - Preliminary - Men's Skiff - 49er - Race 10/11/12 - Marina de Gloria - Rio de Janeiro, Brazil - 16/08/2016. Peter Burling (NZL) of New Zealand and Blair Tuke (NZL) of New Zealand celebrate gold medal. REUTERS/Benoit Tessier

2016 Rio Olympics - Sailing - Preliminary - Men's Skiff - 49er - Race 10/11/12 - Marina de Gloria - Rio de Janeiro, Brazil - 16/08/2016. Peter Burling (NZL) of New Zealand and Blair Tuke (NZL) of New Zealand celebrate. REUTERS/Benoit Tessier

2016 Rio Olympics - Artistic Gymnastics - Final - Women's Floor Final - Rio Olympic Arena - Rio de Janeiro, Brazil - 16/08/2016. First placed Simone Biles (USA) of USA and second placed Alexandra Raisman (USA) of USA (Aly Raisman) pose. REUTERS/Mike Blake

2016 Rio Olympics - Gymnastics training - Rio Olympic Arena - Rio de Janeiro, Brazil - 04/08/2016. (From L) Simone Biles (USA) of USA, Laurie Hernandez (USA) of USA, Madison Kocian (USA) of USA, Gabrielle Douglas (USA) of USA (Gabby Douglas) and Alexandra Raisman (USA) of USA (Aly Raisman) speak to team coordinator Martha Karolyi (R) during training. REUTERS/Damir Sagolj

2016 Rio Olympics - Artistic Gymnastics - Final - Women's Floor Final - Rio Olympic Arena - Rio de Janeiro, Brazil - 16/08/2016. Gold medalist Simone Biles (USA) of USA, silver medalist Alexandra Raisman (USA) of USA (Aly Raisman) and bronze medalist Amy Tinkler (GBR) of Britain pose. REUTERS/Mike Blake

2016 Rio Olympics - Cycling Track - Final - Men's Keirin Final Race for 1st-6th Places - Rio Olympic Velodrome - Rio de Janeiro, Brazil - 16/08/2016. Jason Kenny (GBR) of Britain hugs his girlfriend Laura Trott (GBR) of Britain after winning the gold medal. REUTERS/Eric Gaillard