The numbers we have been working by this year on the road are not power output or speed, but VAM: Vertical Altitude Metres, or how quickly you gain height on a climb. That way it doesn't matter about power output, windspeed, the steepness of the climb or your speed: it's simply a matter of how fast you gain height vertically, as if you were in a lift, measured in metres per hour. The average VAM for a big climb on the Tour last year was 1,400m or 1,500m. When Alberto Contador attacked at Verbier in 2009 he was going at about 1,800m, which is similar to the figures Marco Pantani used to reach.
In the Dauphiné, on the Col du Joux-Plane on the penultimate day, we were climbing at about 1,700 VAM. There aren't many riders out there who can go that fast, and there weren't many able to stay with us on that stage. So that gives me confidence that physically I'm in the right place at the moment. The catch, however, is that the Tour is not just about the numbers. We've got to take those numbers, the physical ability they represent, and perform day after day after day.