Usain Bolt: Athletics 'Will Die' Unless Doping Stops

Ahead of his final race at the World Championships in London, Usain Bolt warned in an interview that dopers have to "stop or the sport will die."

"Hopefully athletes will see what's going on and what they need to do to help the sport move forward," Bolt told BBC Sports. The eight-time Olympic gold medalist will retire from athletics after running in the 100m and 4x100m relay races in the Worlds, which will begin Friday.