I was not interested at all in Formula One when I left; I was very busy with my airline. But slowly I started missing the adrenaline rush and the driving of such fantastic cars at the limit. In reality this urge never disappears when you're a top driver, because I think we're a different breed of people, we need to take chances, we need to push ourselves to the limit all the time, that sort of thing. It stays with you, although you can kill it by losing motivation or other things in your life, but it never leaves you forever.
If you are for a long time at the top you've basically achieved everything you wanted to. Then the ball's breaking stuff starts to be too much: it's not what you do in the car, it's what you do outside the car - the press conferences, the interviews, the sponsorship commitments, the marketing appearances - that sadly go up to a level that the whole package, including the risks you take, the workload you do to get the car to work and for you to be quick in the races, it becomes too much.
It was the same with Schumacher: the need for the adrenaline rush, to push himself to the limit was always there. So without a Formula One car to race with he went on to do motorcycle racing and other stupid things, and obviously that wasn't enough to keep him happy, so he had a problem to sort out and returning to racing was his answer to the problem.
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