To exercise is defined as to engage in physical activity for the purposes of working your body to stay healthy.(noun)
An example of exercise is going to the gym and lifting weights.
The definition of exercise is to use something or to engage in physical activity done in order to stay healthy or to cause someone else to engage in physical activity in order to stay healthy or to put into action.(verb)
See exercise in Webster's New World College Dictionary
Origin: ME & OFr exercice < L exercitium < pp. of exercere, to drive out (farm animals to work), hence drill, exercise < ex-, out + arcere, to enclose < IE base *areq-, to protect, enclose > Gr arkein
See exercise in American Heritage Dictionary 4
Origin: Middle English
Origin: , from Old French exercice
Origin: , from Latin exercitium
Origin: , from exercitus
Origin: , past participle of exercēre, to exercise
Origin: : ex-, ex-
Origin: + arcēre, to restrain.
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