You see, with me, when I'm nervous, I smile and laugh.
At big championships it's not the fastest person, it's the person who gets it right on the day.
To represent your country at a home Olympics is something special and I'm over the moon to be selected for Team GB. I was pleased to get the qualifying time in Berlin earlier this year and my sole focus is getting in the right shape for London.
Plenty of people who are 38 have run really well in the marathon.
From my training I can get a good idea of what I'm capable of.
It's totally different from last year because I came in with good shape with no health worries so it was about going out there and running well and enjoying it.