It's important that athletes can compete on a level playing field. And youngsters coming into the sport can know that if they are working hard and training hard, they'll see a true reflection of where they stand and what they can achieve worldwide and not be swayed by people who are cheating.

I can swim I'm not bad, but not great.

Actually I don't choose to expose myself in public. I choose to compete; the other side just comes with the package.

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.

Never set limits, go after your dreams, don't be afraid to push the boundaries. And laugh a lot - it's good for you!

In my Olympic history I don't think I have achieved my potential as an athlete. That's what I want when I look back at my career. I want to be able to say I gave it my best shot.

I set myself some specific goals, but the key one is just getting myself into as good a shape as possible for one day this year: the Olympic marathon.