It might seem a bit hypocritical of Lance Armstrong to call for the sport of cycling to come clean.
But when a top cycling official held a Twitter Q&A this week, it was Armstrong who jumped in to play the role of anti-doping crusader.
British cycling boss Brian Cookson is campaigning to unseat Pat McQuaid as president of the International Cycling Union when elections come around in September.
Cookson does not believe that current leadership has done enough to repair the reputation of a sport battered by a long history of doping scandals. He has looked at a number of ways to go about this difficult task.