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Four possible ways to work upper body muscles harder Pack heavily Walking, even a casual stroll, is work for core torso muscles. More weight and more strenuous walking will make these muscles work harder. When in doubt, pack it. Carry extra water, extra food, extra clothes. Instead of energy bars, pack a a can of soup and a stove. You can enjoy a hot ...


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You have outlined a couple of assumptions in your question which there is no evidence for. Back in prehistory, people did what they needed to do to survive, and that often wasn't very long. One thing they didn't do, as far as the evidence suggests, is any extra exercise - there was no need for fitness clubs, as they were spending most of there time ...



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