Physical activity is an inclusive term that refers to any expenditure of energy brought about by bodily movement via the skeletal muscles; as such, it includes the complete spectrum of activity from very low resting levels to maximal exertion. exercise is a component of physical activity. the distinguishing characteristic of exercise is that it is a structured activity specifically planned to develop and maintain physical fitness.
"exercise." britannica school. encyclopaedia britannica, inc., 2013. web. 21 oct. 2013.
how is the word expenditure used in this excerpt?
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