Formula 1 drivers must be superbly physically fit, but everything is subject to the fact that on the day of the race in maximum physical in mental condition, as even small deviations downwards can mean significantly worse results.
It may not really look the best on TV, but racers are subjected to it during the race extraordinary forces, which ordinary mortals can't even imagine, and the race lasts an average of an hour and a half, so it's appropriate physical fitness how important for a good result.
This has not always been the case, as it has been systematic training in this area appeared only in the eighties of last century. He was one of the first to be aware of the influence of fitness on the result Ayrton Senna, and took his message to a new level above all Michael Schumacher.