30 August 2013 Last updated at 11:42

Usain Bolt: Ben Johnson says he would have beaten Jamaican

Disgraced former sprinter Ben Johnson tells BBC Sport that he would have beaten current Olympic and world champion Usain Bolt over 100m.

The Canadian, who says it is time he was forgiven after being stripped of the 100m title at the 1988 Seoul Olympics after testing positive for anabolic steroids, claims he had more power than Jamaican Bolt.

Johnson, now 51, said he believed doping would always be a part of track and field as athletes were willing to take a chance in order to win, adding that he took drugs because he believed his competitors were also doping. He is now working for the #ChooseTheRightTrack  campaign.