One thing I think is important look at is the stress you put on yourself during a hunt. Besides you reglur work (what ever in my be) I think you need to minic the hours,work load,lack of sleep,ect.. you will encounter. It dose not need to be all the time just enough to break up you routine. Walk with your pack up hills up stairs ect. Stay up late one night(12.00 am) sleep on the floor,then get up real early(3.00 am) and do your workout. I know I don't always get the right sleep when I hunt. In a week of elk hunting we put are bodys through h#$% you can be in phsyical shape but not in mental shape. A hunt can get to you down pretty quick when you haven't ate right,sleep bad,haven't seen a elk in days. I like to know what my bodys limits are before I get out there. Pace yourself when you are hunting remember it not a marathon it's O.K. to take a slow day. For those that think just because you are a big guy you can't be in shape,look at me. I may not be in marathon shape but I walk ,bike,stress my body, enough to make it to the top everyday with a smile.