There’s an interesting article in the August Bicycling magazine that explains how Floyd Landis has done it.
When he was a young cyclist, Landis sat down with cycling doctor Arnie Baker and plotted out an eight year plan. In the early years, he rode as much as 24,000 miles per year – 40 hours a week on the bike, week after week. “That wasn’t designed to give him results that year,” Baker told Bicycling. Instead of worrying about winning year to year, he was building the engine for the future.