London, England (CNN) -- Tuesday marks two years to go until the London 2012 Olympics, the start of what organizing committee chief Sebastian Coe calls "the killing zone" -- the final stretch of an 800-meter race where you can see the finish line but still have to work to get there.
Coe, who won two Olympic silver medals in track and field, said recently he is preparing for "two very tough years" to make sure London can deliver the Games.
"This is the business end of the race now," he said. "You don't want to make errors, you don't want to make mistakes, you don't want to be off the pace, you want to know all the exit routes and all the strategies. You need to be very alert".
Coe said the the Games are "on time and on budget," and he has few concerns that the world economic downturn will have an effect on preparations.
CNN
