Exertion

Part of speech: noun (n.)

The act of exerting, or putting into motion or action; the active exercise of any power or faculty; an effort, esp. a laborious or perceptible effort; as, an exertion of strength or power; an exertion of the limbs or of the mind; it is an exertion for him to move, to-day.

Synonyms: Attempt; endeavor; effort; essay; trial. See Attempt.