My own experience (and Steve House and his co-authors don't dispute it) is that to fully prepared for a mountain endeavor is best achieved with a blend of strength training and shorter high output exercise with a large dose of longer, lower intensity aerobic training.
Trail running is fine, but personally I think hiking is as good or better as it more closely mimics what you're going to be doing in the Fall. Add a pack by all means. If you can get this longer, lower intensity training in the mountains, better yet.
I do see folks that have blinders on in regards to longer aerobic stuff, but also see folks that think they can ignore strength training and higher intensity training- both are flawed.
Trail running is fine, but personally I think hiking is as good or better as it more closely mimics what you're going to be doing in the Fall. Add a pack by all means. If you can get this longer, lower intensity training in the mountains, better yet.
I do see folks that have blinders on in regards to longer aerobic stuff, but also see folks that think they can ignore strength training and higher intensity training- both are flawed.