Thank you for your recommendations. I actually ordered the trekking training plan that was suggested and am finding it very helpful. It’s a little more than I need to just be in good shape for short backpacking trips but there are some good ideas in it. I’m more or less doing what you are doing, two to three sessions on treadmill and or stairclimber and hoping to find a good building nearby with tons of stairs which I’ve yet to find. I also try to do one evening hike every week or two.