Lance Armstrong participates in a mountain bike competition in Colorado . He talks 2 minutes after announcing he does n't challenge a doping agency 's charges . ` ` I do n't have anything to worry about , '' he says , insisting he 's at ease with move . In February 2011 , Armstrong announced his retirement from professional cycling , though he continued to compete in triathlon events . An anti - doping agency has accused him of performance - enhancing drug violations .
Lance Armstrong participates in a mountain bike competition in Colorado . He talks 2 minutes after announcing he does n't challenge a doping agency 's charges . ` ` I do n't have anything to worry about , '' he says , insisting he 's at ease with move . An anti - doping agency has accused him of performance - enhancing drug violations .