Lewis Hamilton would challenge formula one rival and countryman Jenson Button to a fitness challenge to decide who is in the best physical shape.

The 23-year-old McLaren driver was impressed this week when he learned that Button, who drives for Honda, finished 117th of the 1700 entrants in a semi-professional triathlon last month.

"That's pretty good," Hamilton admitted, but "I think I'm fitter than Jenson -- but I've got to prove it," he told the British newspaper The Daily Mail.

"So if someone wants to get us going up against each other I'd look forward to it," he added.

Reigning world champion Kimi Raikkonen, however, would probably not be interested in taking part in the battle of machismo.

The laconic Finn, who drives for Ferrari, told the Daily Telegraph that he only trains "if I feel like it".

"If not, I do more or less what I feel like. I don't have schedules. I never do any planning. I hate planning," Raikkonen added.

Source: GMM