"I'm constantly watching my weight for my job, and I've trained so hard this year to be ready for this season-more rigorously than ever - but people who tune in to Formula One have no comprehension of what we have to do to be fit. It's so physical. This year, the car is way faster than when you came to the race. And the physicality has gone up quite a lot, at least 20 to 30 percent. People don't see that. They don't see us as athletes. They just see us driving."