'Exercised' in the Bible

And I gave my heart to seek and search out by wisdom concerning all things that are done under heaven: this sore travail hath God given to the sons of man to be exercised therewith.

I have seen the travail, which God hath given to the sons of men to be exercised in it.

All this I have seen and applied my mind to every deed that has been done under the sun wherein a man has exercised authority over another man to his hurt.