Artistic gymnastics athletes Daria Spiridonova, Angelina Melnikova, Maria Paseka, Seda Tutkhalian, Aliya Mustafina (L-R) of Russia leave after a training session for the Rio 2016 Olympic Games at the Rio Athlete's Park in Rio de Janeiro, Brazil, July 26, 2016.Photo:Xinhua

Artistic gymnastics athlete Danis Abliazin (R) of Russia reacts during a training session for the Rio 2016 Olympic Games at the Rio Athlete's Park in Rio de Janeiro, Brazil, July 26, 2016.Photo:Xinhua

Artistic gymnastics athletes of Russia walk to the Olympic village after their training session for the Rio 2016 Olympic Games at the Rio Athlete's Park in Rio de Janeiro, Brazil, July 26, 2016. Photo:Xinhua

Artistic gymnastics athlete Nikita Nagornyy of Russia practises during a training session for the Rio 2016 Olympic Games at the Rio Athlete's Park in Rio de Janeiro, Brazil, July 26, 2016.Photo:Xinhua

Artistic gymnastics athlete Nikita Nagornyy (R) of Russia is seen during a training session for the Rio 2016 Olympic Games at the Rio Athlete's Park in Rio de Janeiro, Brazil, July 26, 2016. Photo:Xinhua

Artistic gymnastics athlete David Belyavskiy of Russia gestures during a training session for the Rio 2016 Olympic Games at the Rio Athlete's Park in Rio de Janeiro, Brazil, July 26, 2016. Photo:Xinhua

Artistic gymnastics athlete Danis Abliazin (R) of Russia walks to the Olympic village after a training session for the Rio 2016 Olympic Games at the Rio Athlete's Park in Rio de Janeiro, Brazil, July 26, 2016. Photo:Xinhua

Artistic gymnastics athlete Daria Spiridonova of Russia leaves after a training session for the Rio 2016 Olympic Games at the Rio Athlete's Park in Rio de Janeiro, Brazil, July 26, 2016. Photo:Xinhua