This has always puzzled me. As i stand on the earth i require energy to exert a force over gravity to enable me to keep standing. The net force between me and the the earth is zero and thus i remain standing still. However my amount of energy depletes as a result of this and will culminate in me being unable to stand as a result of the energy loss. Where does the energy for the earth come in order to apply the force of gravity between me and it. Since i appear to suffer a loss of energy what happens with respect to the earth exerting a force over me.
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