Amateur runner heads for Bird's Nest

Guo Xiuju, a 51-year-old from Qingdao, Shandong province, has never had an opportunity to go inside Beijing's National Stadium, better known as the "Bird's Nest".

In 2013, she visited but missed the opening hours. Instead, she lingered outside, where she had her photograph taken for 10 yuan ($1.60).

What Guo could not have imagined back then was that two years later, she would be invited back not as a visitor, but as an athlete, running in the Beijing 2015 IAAF World Championships. She will compete in the 400-meter category for veteran runners, a competition open to athletes over the age of 35.