Get to the gym with your pack frame, throw some plates on there and go crazy on the stair stepper. Be sure to use a ratchet tie down strap so the plates don't get wiggly on you.
I got a few odd looks at first, but then when people started asking why I was doing this and I told them that you need be able to get meat off the mountain quick before it spoils, something clicked for them. A few of them said that they were very anti-hunting until now, but seeing the work that I was putting in to be sure that I didn't waste the animal I harvested at least opened their minds a bit! Pretty cool