Ok so it was 5.2 km and it was down to me not checking on the GPS but guessing how far I'd run before I stopped.
Even so I ran 5.2km in 36:31 minutes... or 7 mins per km. I realise that this is no speed record or anything, but you have to remember (actually you don't have to at all) that I never got this far last year. In fact I may have caused myself more problems than I solved last year trying to even get here.
I'm just chuffed as I only have to learn to:
b) cycle in a different position,
c) stay fit,
d) learn to do all these things back to back,
...and I'll be ready to do a triathlon!!