Imagine that you have a personal goal, such as exercising regularly. Now, imagine you also have a romantic partner. That partner can either help (e.g. by encouraging you to join them in exercising) or hinder (e.g., by encouraging you to stay home and binge watch your favorite TV show) your pursuit of your goal to exercise regularly. If your partner helps you, researchers would say that your partner is instrumental to helping you pursue the goal. If instead of helping you, your partner hindered, or got in the way of completing the goal or didn’t help you to complete it, then researchers would say that your partner is non-instrumental to helping you complete the goal.