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Nov12-12, 04:40 PM
Sci Advisor
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sophiecentaur's Avatar
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Physics of weight lifting

Your calculation tells you that you are doing 1.6kcal of equivalent useful work. Meanwhile, your body is consuming loads more energy in just performing that exercise - around four times as much.
Look at this link for some representative values of work done and food consumed. It requires an awful lot of mechanical work to burn off a few pies!