Hockey Ref wrote:Training: Nothing beats real-world conditions. Load your backpack the same as you'd have it for your actual trip...and do what you can to simulate "real world" conditions.
I agree with Hockey Ref. It's also a great way to work the kinks out of your gear system so that you won't be distracted from the views by a strap rubbing you wrong.
Another way I like to "train" is to load my daypack with jugs of water and then go walking (or hiking, if I have time to get up into the nearby mountains). The benefit of using water (rather than gear or weights) is that I can load myself up as heavy as I want and know that there's always the option of dumping part of it if I later decide I'm carrying more than is good for me -- or if I just decide that I've had enough "training" midway through the day and want to go light and breezy again.
My goal is always to get comfortable with a bit more weight than I expect to be carrying on my actual trip. That way things will seem relatively easy there in comparison to what I'm used to. Also, I think building up some extra capacity is a good way to prepare my body for the big elevation difference between home and Glacier.