Earth's gravitational field is always pulling us toward the center of the Earth, and our feet have to exert an equal and opposite force to keep us upright.
This means that all of the work we are doing makes us use more energy, so if you against gravity you get tired so fast.
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Answer:
Earth's gravitational field is always pulling us toward the center of the Earth, and our feet have to exert an equal and opposite force to keep us upright.
This means that all of the work we are doing makes us use more energy, so if you against gravity you get tired so fast.