Last Colorado bowhunt I trained with a pack and had some decent foothills in my back yard. Gravel pit close also that had pretty decent hills but very steep. I used sand bags in my pack. Each weighed 25 lbs. Started with 2 and finished at 6 just before leaving for the hunt. Strictly for incline and stress walking up and down. Made a huge difference from my first CO hunt. One thing I'll say right now. Working out with weights is great. I do it everyday. Heavy leg presses 500-550lbs for 4-5 sets of 12 doesn't cut it for walking in mountains. No comparison to actual simulated weight load carrying. Don't get me wrong, I'm in the best shape of my life do to working out but cardio and endurance training is not the same as pushing iron in your gym. At 57 years old, I'm still young. Workouts are 75% lifting/25% cardio. Another 10 years and my workouts will be more 50% cardio/50% lifting. Anybody that plans a hunt in mountains, do yourself a favor and train exactly as you will be hunting.