(n.) That which is done for the sake of exercising, practicing, training, or promoting skill, health, mental, improvement, moral discipline, etc.; that which is assigned or prescribed for such ends; hence, a disquisition; a lesson; a task; as, military or naval exercises; musical exercises; an exercise in composition.
EXERCISE
Meaning of EXERCISE in English
Webster's English dictionary. Английский словарь Webster. 2012