Bung some heavy ass weights in a bag, and go for a walk.
As someone who lead many expiditions across many mountains that i chose to not know the name of out of spite for them, my tried and tested method for getting people into shape was putting 25 kilos of weight into a rucksack and going off for a walk. This is much more than you normally would carry, but the principle is, train hard now, get used to heavier weights on your back, and have an easier time on the actual day.
If you do take up backpacking, spend the money on a good pair of boots (mine cost £300, but are the best pair of shoes i own) and a good rucksack (and for gods sake, get it fitted in store), because those are the items that let 90% of people down.
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