Youre 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%. – Jenson Button
I keep my weight low, although you need to be able to move your weight around the race car to change the balance. Im 6ft and Im 70kg so I havent much fat on me. – Jenson Button

