Powered by Rubens Barrichello took some time out of his busy day to explain how gruelling testing can be, especially after a tough race such as Monaco. The difficulty here is finding the right set-up. This means you have to learn to separate things in your mind.
Testing can be more tiring than racing.
For example at the first day here in Magny Cours, I did 78 timed laps. It is more physically demanding. Our own Fiorano track can be mentally tiring, as it is a short circuit, so you do so many laps. In some ways, you know it too well. The result of this is that sometimes, if you have a problem with the car, instead of analysing it to try and solve it, you simply drive round the problem, because you know the circuit so well.