Just watched the 2 episodes and yeah pretty impressed.
Like others have said I think I could do most of the celebrity challenges with out too much problem. However I dont think I could do the amount of running Eddie did.
I mean he hasnt just done a bit of running these are some serious distances. Also its the fact he's not doing anything especially cool or extreme he just runs.
Although you can see he obviously loves the lime light, the people he mets and places he goes are just as important to the story as he is.
And also considering how tough it looks he complains remarkably little, if at all, and he seems like a really nice chap. Compare this to say James Cracknell in On Thin Ice.