Chinese atheles vow anti-doping for London Olympics

China's Olympic athletes and coaches make a vow to reject using banned substances during the London 2012 Games in ceremony at the National Sports Training Center on Tuesday.

Before making the oath in front of the national flag, the national track and field team attended training about anti-doping measure and took an exam.

"Athletes and coaches are qualified to join the national team when they have passed the exam, vowed to abide by anti-doping, and signed the commitment letter," said Shen Chunde, vice-director of the National Athletic Administrative Center.