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Moving about requires energy. Moving a measured amount of mass a measured distance requires a specific amount of energy. Metabolism is the body expending energy. More energy is expended when more work is done, and there is no getting around this fact. More energy is also expended to sustain the living tissues of the body, including fat and muscle.
You can get a rough idea of how much energy is being expended by measuring respiration (how heavy someone is breathing). Energy is produced by burning "calories" with oxygen, and the faster energy is burned, the more oxygen will be required by heavier breathing.
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