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As a general rule, to develop strength and endurance in doing X, you need to do X. Thus, I suggest that (1) the OP continue to take two day hikes, with a heavier pack than he has in the past; (2) ...
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As a general rule, to develop strength and endurance in doing X, you need to do X. Thus, I suggest that (1) the OP continue to take two day hikes, with a heavier pack than he has in the past; (2) ...