Just thought I'd throw this one up.
What do you all do to stay fighting fit for those elusive back country trips.

We are not all graced with high mountains at our backdoor to keep the "EDGE" that's helpful while in the wilds.
For me it's regular walks around the local streets with a loaded 17kg pack in my walking shoes. Normally I just put water filled milk bottles, weights etc in the pack, then stuff my old syn bag around that to fill the pack to capacity (Not a fan or squeeking packs). If I have the time there are a few short local steep 4x4 tracks I can go up and down (1hr round trip), GNW above Freemans waterhole, up to the handgliders lauch site above Heaton gap and down again with the pack on. A lot of locals seem to train on this for Kokoda.
Keeps me fit and I find that when I do get out bush I don't have to spend the first day or 3 getting into "walker" mode

Best thing I find is the exercise wearing my pack. Get's my feet, legs and shoulders used to the load.
I have found the pack training the best, especially with some decent hills thrown in. Gyms and running help but I have found those training methods secondary.
Nothing worse than planning a fantastic trip and turning up unprepared physically.
I'm sure once upon a time either we or our companions have turned up unprepared and paid the price for that.....
So, What do you do to keep "walker" fit.