Just saw your awesome challenge! It made me wonder about our walk to school and I worked out (being conservative) that I am doing 1000kms! Makes me feel better about sitting on my butt these school hols!!
Anyway, I won't join up as I have trouble keeping up with the forum stuff as it is and I'm on the pull up challenge (don't want to overload and quit).
Just wanted to wish you all success - walking is the best.