to do at all costs; to spare no effort; to throw all of one's energy into a task

(idiom) to spare no effort; to do all one can; to exert one's full strength

To devote all of one's heart and energy to something; heart and soul; with all one's might

To exert all of one's strength or effort toward a goal; to put in every ounce of energy

even when a lion fights a rabbit, it uses its full strength; to exert full effort even when tackling small or easy tasks