Rod, staying in "prime shape" is not a goal I can aim for. I just don't see how anyone with a life outside the gym could hope for that. Life has to many other good things to enjoy.
But staying in "good shape" is what I try to maintain. Then when a big hike is near, I can increase the workout frequency or intensity without making any huge changes.
Don't kill yourself with the workouts. If you do, you will probably quit after a few times.
