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%.
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.
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When you're doing a TV show it's not like you just shoot for six weeks and you're in an editing room with all of your footage. It's like a guitar or a car you have to fine tune things. You stop doing what's not working you work on what is working and you add things that do work.
