Welcome to BBC iD
Early next week, there will be a change to how you leave comments on this blog - we're upgrading our current registration system to a new and improved one. When you log in to the new system, you will be prompted to upgrade your existing account, and you should be able to do that with a minimum of fuss. More details on this can be found on the BBC Internet Blog.

I'm Katharine Merry, former world 400m number one and an Olympic bronze medallist at Sydney 2000. I'm now a mentor to junior athletes as well as working in radio and TV, and as a trackside presenter at major events. I'll be aiming to give you a behind-the-scenes insight to the world of athletics.