Royal Gymnastics: Princess in action

Japan's Princess Aiko (top L) helps her classmate to perform a handstand at the Gakushuin elementary school for her school's athletic festival in Tokyo October 12, 2013. Crown Prince Naruhito and Crown Princess Masako attended the festival. (REUTERS)

Japan's Princess Aiko (2nd R) performs group gymnastics with fellow students at the Gakushuin elementary school for her school's athletic festival in Tokyo October 12, 2013. Crown Prince Naruhito and Crown Princess Masako attended the festival. (REUTERS)

Japan's Princess Aiko (2nd R) performs group gymnastics with fellow students at the Gakushuin elementary school for her school's athletic festival in Tokyo October 12, 2013. Crown Prince Naruhito and Crown Princess Masako attended the festival. (REUTERS)

Japan's Princess Aiko (R) performs with a hoop for a group gymnastics session with fellow students at the Gakushuin elementary school for her school's athletic festival in Tokyo October 12, 2013. Crown Prince Naruhito and Crown Princess Masako attended the festival. (REUTERS)

Japan's Princess Aiko (2nd row R) performs group gymnastics with fellow students at the Gakushuin elementary school for her school's athletic festival in Tokyo October 12, 2013. Crown Prince Naruhito and Crown Princess Masako attended the festival. (REUTERS)

Japan's Princess Aiko performs with a hoop during a group gymnastics session with fellow students at the Gakushuin elementary school for her school's athletic festival in Tokyo October 12, 2013. Crown Prince Naruhito and Crown Princess Masako attended the festival. (REUTERS)