keep sb. motivated(When trained in the lab to open a two-step puzzle box, bumblebees of the species Bombus terrestris could teach the solution to another bee that had never seen the box before. This naive bee would not have solved the puzzle on its own. To teach the 'demonstrator' bees the non-intuitive solution in the first place, researchers had to show them what to do and offer them a reward after the first step to keep them motivated. (sciencealert.com)ART Vancouver)
