A lot of people think Formula One isn't a sport because everyone drives a car when they go to work in the morning. But we're pulling up to six G on a corner or during breaking, which is almost like being a fighter pilot. So we have to do a lot of work on our neck muscles.
For me, triathlons were something that was down to me and my fitness. Now, I really enjoy the pain in the triathlon of chasing someone down. It's a bit like chasing down Nico Rosberg in the last few laps at Silverstone - it makes you feel alive.
I can't eat whatever I want, definitely not. I'm always controlled because I do a lot of fitness and triathlons, not just Formula One, so I always make sure I eat the right things.
I don't purposely speed, but I might go over by five or six miles an hour from time to time. It doesn't give me a buzz driving on normal roads, because I can't go fast enough. It's never going to be anything like an F1 car.
I keep my weight low, although you need to be able to move your weight around the race car to change the balance. I'm 6ft and I'm 70kg so I haven't much fat on me.
I need to develop a car and engineer a car in a position that feels comfortable for me, and I don't think anyone can do a better job than I can in that position. The problem for me is if I can't get the car there I do struggle more than some.
I've spent as much as 30 grand on a watch but it's not about flaunting my wealth. I don't have many extravagances but watches are my biggest one. I must have 30 of them now. I've been collecting since the age of nine, when I won a black TAG in a karting event.
In my hometown there is a pub named after me - The Frome Flyer on Jenson Avenue. How cool is that?!
In the car and in front of the camera I tend to be very calm but behind the scenes I can get fired up and passionate, I just don't see the need to shout my mouth off in public.
My 'Movember' moustache was never going to be as big as Nigel Mansell's, but I tried my best. The amazing thing is that when you try to grow a moustache, you notice everyone else's. There are some amazing moustaches on the grid.
My time at Honda was amazing. Some of my best times in Formula One, actually. I might not have won races, just one race, but I had a lot of fun.
Resting for me is fitness training.
The fast, flowing parts, the high-speed corners, that's where a Formula One car is at its best - changes of direction, pulling high g-forces left and right.
The only time I think about life beyond F1 is when I contemplate becoming a dad. But there's no way that's going to happen while I'm still racing. To be successful in F1 you need to be very selfish in lots of ways and you're away from home for long periods. That's not the kind of father I want to be.
To drive an F1 car you have to be a little mad. On the morning of a race there's a mix of excitement and fear. If it's a wet track, then it's worse as you're not in control most of the time, which is the thing all drivers fear the most.
To understand the intensity of driving an F1 car, you have to be in it. When you're driving a 750hp machine at 200mph, the noise and the vibrations are incredible. The G-force when you take big corners is like someone trying to rip your head off. You hit the brakes, and it feels as if the skin is being pulled off your body.
We all drive differently and have different styles. For me I need a car I can develop beneath me and feel comfortable in. If the car feels neutral and unbalanced it doesn't work for me.
We go through the whole season working on next season's car and developing the car and making sure we fit in the car and all that sort of stuff. And we obviously give ideas of what we would hope next year's car would have even if it's small things like buttons on the steering wheel and different positions and whatever.
When I do retire, I know for a fact that I'll never be able to replace the incredible feeling I get when I'm driving an F1 car.
When I'm on my own, I can be negative. I need my friends and family around to help pick me up if I've had a bad qualifying session. I think insecurity plagues a lot of sportspeople.
When you're in a car which can win every race, or fight for a win every race, that is pressure.
You're pulling 4-5G for a lot of the corners around the lap. We build up lactic acid because there are a lot of vibrations in the car, and you have to have strong legs to hit the brake pedal. We need to be fit to do every lap at 100%.