exertion

noun

1. An expenditure of physical or mental effort.

   “Again she felt a return of that utter despondency which had fallen upon her after Guido's death: but then she could indulge in it unmolested, and that was something of relief: now she was forced into exertion, that sort of exertion of all the most tiresome, because the least interesting...”

   “Liverpool have looked a little jaded from their exertions in recent weeks and there was an air of desperation about their attempts to restore equality in the closing minutes in the face of the experience and game management of opponents who are time-served masters of the Champions League art.”