I have just got home from completing a 10km walk.
Ok so it doesn't sound so grand but it my first one (unless you count the 12km City to Surf, I ran as a kid with my Dad - I must have been much fitter back then!)
My time was about 90 minutes which I think is pretty good and I can still walk so no major injuries.
I think I would even consider doing it again sometime.......
If you want to see my results - check me out here - scroll down to the 10km walk.