Doping is using drugs enhance your performance in sports. There are many articles on this but the two thing that strike me personally are: that it is so complicated and that he did it for about a decade! The way that USADA (US Anti-Doping Agency) was when one of his teammates told the world about this. Lance Armstrong wasn't the only person who did this, one report says that 12 out of 15 Tour De France were won by blood dopers. You can find out about doping
here,
here, or
here.
