thanks for the considered replies everyone.
perhaps 2 hours of walking isn't as bad as i made it out - i do live in the countryside after all! the problems will come when i land myself a job in the city (i'm a recent graduate), but maybe then the little and often approach will work. lots to think about here, so thanks. mike - you're pics are amazing, very inspirational! almeeka i know what you mean about the wii games - i got a playstation move, and when playing archery on that you can really feel the burn.
if anyone else has thoughts i would love to hear them.