gym is 40% the other 60% is in the kitchen, but you have to have both not just one. You cant just diet and expect a change, lifestyle is what needs to change.
It is a good trip, and worth the travel. There are people everywhere, and you are battling open terrain, weather, silly caribou, and other hunters coming or going from a hunting spot. Enjoy it for remoteness and the new adventure. I will be coming that way on the tail end of your trip so good...