China's Chen Yibing kisses the apparatus after competing in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Mike Blake (BRITAIN - Tags: OLYMPICS SPORT GYMNASTICS TPX IMAGES OF THE DAY)

China's Chen Yibing celebrates winning a silver medal in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Mike Blake (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

China's Chen Yibing celebrates winning a silver medal in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Mike Blake (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

China's Chen Yibing celebrates winning a silver medal in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Mike Blake (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

Brazil's Arthur Nabarrete Zanetti (C) celebrates winning a gold medal with silver medallist China's Chen Yibing (R) and bronze medallist Italy's Matteo Morandi in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Mike Blake (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

Brazil's Arthur Nabarrete Zanetti (C) celebrates winning a gold medal with silver medallist China's Chen Yibing (L) and bronze medallist Italy's Matteo Morandi in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Mike Blake (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

Silver medallist China's Chen Yibing stands during the men's gymnastics rings victory ceremony in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GYMNASTICS OLYMPICS)

Silver medallist China's Chen Yibing (L) shakes hands with gold medallist Brazil's Arthur Nabarrete Zanetti during the men's gymnastics rings victory ceremony in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GYMNASTICS OLYMPICS)

Silver medallist China's Chen Yibing stands during the men's gymnastics rings victory ceremony in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GYMNASTICS OLYMPICS)

From L-R, silver medallist China's Chen Yibing, gold medallist Brazil's Arthur Nabarrete Zanetti and bronze medallist Italy's Matteo Morandi celebrate in the men's gymnastics rings victory ceremony in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GYMNASTICS OLYMPICS)

China's Chen Yibing competes in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Mike Blake (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

China's Chen Yibing competes in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Mike Blake (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

China's Chen Yibing kisses a support post after competing in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GYMNASTICS OLYMPICS)

China's Chen Yibing kisses a support post after competing in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GYMNASTICS OLYMPICS)

China's Chen Yibing competes in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Mike Blake (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS TPX IMAGES OF THE DAY)

China's Chen Yibing competes in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Mike Blake (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

China's Chen Yibing kisses the apparatus after competing in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Mike Blake (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

Brazil's Arthur Nabarrete Zanetti (L) celebrates winning a gold medal with silver medallist China's Chen Yibing in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Mike Blake (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

China's Chen Yibing stands after competing in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GYMNASTICS OLYMPICS)

China's Chen Yibing competes in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GYMNASTICS OLYMPICS)

China's Chen Yibing competes in the men's gymnastics rings final in the North Greenwich Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GYMNASTICS OLYMPICS)

Chen Yibing of China stands after competing on the horizontal bar during the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: SPORT GYMNASTICS OLYMPICS)

Second placed Yusuke Tanaka, Kohei Uchimura, Koji Yamamuro and Kazuhito Tanaka of Japan react as China's Feng Zhe, Guo Weiyang, Chen Yibing, Zhang Chenglong and Zou Kai (5L-R) celebrate gold after the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Dylan Martinez (BRITAIN - Tags: OLYMPICS SPORT GYMNASTICS)

Feng Zhe (L-R) of China and team mates Guo Weiyang, Chen Yibing, Zhang Chenglong, Zou Kai celebrate with their gold medals after taking first place in the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Phil Noble (BRITAIN - Tags: OLYMPICS SPORT GYMNASTICS)

Feng Zhe (L-R) of China and team mates Guo Weiyang, Chen Yibing, Zhang Chenglong, Zou Kai celebrate with their gold medals after taking first place in the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Phil Noble (BRITAIN - Tags: OLYMPICS SPORT GYMNASTICS)

Feng Zhe (L-R) of China and team mates Guo Weiyang, Chen Yibing, Zhang Chenglong, Zou Kai celebrate with their gold medals after taking first place in the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Phil Noble (BRITAIN - Tags: OLYMPICS SPORT GYMNASTICS)

Britain's Daniel Purvis, Max Whitlock, Louis Smith, Kristian Thomas and Sam Oldham (front, L-R) wave as China's Feng Zhe, Guo Weiyang, Chen Yibing, Zhang Chenglong and Zou Kai (L-R) watch after the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Dylan Martinez (BRITAIN - Tags: OLYMPICS SPORT GYMNASTICS)

Guo Weiyang (L-R) of China with team mates Feng Zhe, Zou Kai and Chen Yibing celebrate with their coach in the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Dylan Martinez (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

Guo Weiyang (L-R) of China with team mates Feng Zhe, Zou Kai and Chen Yibing celebrate in the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Dylan Martinez (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

Feng Zhe (L-R) of China and team mates Guo Weiyang, Chen Yibing, Zhang Chenglong, Zou Kai celebrate with their gold medals in the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Dylan Martinez (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

Feng Zhe (L-R) of China and team mates Guo Weiyang, Chen Yibing, Zhang Chenglong, Zou Kai celebrate with their gold medals in the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Dylan Martinez (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS TPX IMAGES OF THE DAY)

Feng Zhe (R) of China walks with team mates Guo Weiyang (2nd R), Chen Yibing (3rd R) as they celebrate winning a gold in the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Dylan Martinez (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

Chen Yibing of China competes in the pommel horse during the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Mike Blake (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

Chen Yibing of China gestures after competing in the pommel horse during the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Mike Blake (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

Chen Yibing of China competes in the rings during the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: OLYMPICS SPORT GYMNASTICS)

Chen Yibing of China competes in the rings during the men's gymnastics team final in the North Greenwich Arena during the London 2012 Olympic Games July 30, 2012. REUTERS/Dylan Martinez (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

Chen Yibing of China waves after competing on the rings
at the men's gymnastics qualification in the North Greenwich Arena during the London 2012 Olympic Games July 28, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

Chen Yibing of China competes in the pommel horse at the men's gymnastics qualification in the North Greenwich Arena during the London 2012 Olympic Games July 28, 2012. REUTERS/Dylan Martinez (BRITAIN - Tags: SPORT GYMNASTICS OLYMPICS)

Chen Yibing of China dismounts from the rings at the men's gymnastics qualification in the North Greenwich Arena during the London 2012 Olympic Games July 28, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: SPORT OLYMPICS SPORT GYMNASTICS)

Chen Yibing of China practices on the pommel horse during men's gymnastics podium training at the 2012 London Olympic Games in London July 25, 2012. REUTERS/Brian Snyder (BRITAIN - Tags: SPORT OLYMPICS GYMNASTICS)

Chinese gymnast Chen Yibing works out on the parallel bars during men's gymnastics podium training before the 2012 London Olympic Games in London July 25, 2012. REUTERS/Mike Blake (UNITED KINGDOM - Tags: SPORT OLYMPICS GYMNASTICS)

Chinese gymnast Chen Yibing works out on the rings during men's gymnastics podium training before the 2012 London Olympic Games in London July 25, 2012. REUTERS/Mike Blake (UNITED KINGDOM - Tags: SPORT OLYMPICS GYMNASTICS)

Yibing Chen of China performs on the rings during the men's team final at the 40th World Artistic Gymnastics Championships in Stuttgart September 6, 2007. REUTERS/Ina Fassbender (GERMANY) BEST QUALITY AVAILABLE

China's Chen Yibing competes on the rings during the men's apparatus final at the Artistic Gymnastics World Championships in Tokyo October 15, 2011. REUTERS/Toru Hanai (JAPAN - Tags: SPORT GYMNASTICS)

China's Chen Yibing bites his gold medal at the award ceremony for the rings during the men's apparatus final at the Artistic Gymnastics World Championships in Tokyo October 15, 2011. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT GYMNASTICS)

China's Chen Yibing kisses the pole of rings after competing in the event at the men's apparatus final at the Artistic Gymnastics World Championships in Tokyo October 15, 2011. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT GYMNASTICS)

China's Chen Yibing reacts after competing on the rings during men's apparatus final at the Artistic Gymnastics World Championships in Tokyo October 15, 2011. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT GYMNASTICS)

China's Chen Yibing competes on the rings during men's apparatus final at the Artistic Gymnastics World Championships in Tokyo October 15, 2011. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT GYMNASTICS)

China's Chen Yibing reacts after competing on the rings during the men's team final at the Artistic Gymnastics World Championships in Tokyo October 12, 2011.
REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT GYMNASTICS)

China's Yang Mingyong (L) celebrates with his teammates Chen Yibing after performing the pommel horse during the men's team final at the Artistic Gymnastics World Championships in Tokyo October 12, 2011.
REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT GYMNASTICS)

China's Chen Yibing competes on the rings during the men's team final at the Artistic Gymnastics World Championships in Tokyo October 12, 2011. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT GYMNASTICS)

China's Chen Yibing (C) celebrates his gold medal with compatriot silver medalist Yan Mingyong and Taiwan's bronze medalist Chen Chih-yu (R) after the men's rings final during artistic gymnastics at the 16th Asian Games in Guangzhou, Guangdong province, November 16, 2010. REUTERS/Carlos Barria (CHINA - Tags: SPORT GYMNASTICS)

China's Chen Yibing (C) celebrates his gold medal with compatriot silver medalist Yan Mingyong and Taiwan's bronze medalist Chen Chih-yu (R) after the men's rings final during artistic gymnastics at the 16th Asian Games in Guangzhou, Guangdong province, November 16, 2010. REUTERS/Carlos Barria (CHINA - Tags: SPORT GYMNASTICS)

China's Chen Yibing celebrates his gold medal after the men's rings final during artistic gymnastics at the 16th Asian Games in Guangzhou, Guangdong province, November 16, 2010. REUTERS/Carlos Barria (CHINA - Tags: SPORT GYMNASTICS)

China's Chen Yibing celebrates his gold medal after the men's rings final during artistic gymnastics at the 16th Asian Games in Guangzhou, Guangdong province, November 16, 2010. REUTERS/Carlos Barria (CHINA - Tags: SPORT GYMNASTICS)

China's Chen Yibing performs a routine on the rings during artistic gymnastics at the 16th Asian Games in Guangzhou, Guangdong province, November 13, 2010. REUTERS/Carlos Barria (CHINA - Tags: SPORT GYMNASTICS)

China's (from L) Chen Yibing, Yan Mingyong and Feng Zhe pose with their gold medals after the artistic gymnastics team final at the 16th Asian Games in Guangzhou, Guangdong province, November 13, 2010. REUTERS/Carlos Barria (CHINA - Tags: SPORT GYMNASTICS)

China's Chen Yibing performs a routine on the pommel horse during artistic gymnastics at the 16th Asian Games in Guangzhou, Guangdong province, November 13, 2010. REUTERS/Carlos Barria (CHINA - Tags: SPORT GYMNASTICS)

China's Chen Yibing performs a routine on the horizontal bar during the men's artistic gymnastics event at the 16th Asian Games in Guangzhou, Guangdong province, November 13, 2010

China's Chen Yibing performs a routine on the vault during artistic gymnastics at the 16th Asian Games in Guangzhou, Guangdong province, November 13, 2010. REUTERS/Carlos Barria (CHINA - Tags: SPORT GYMNASTICS)