Too often we get frustrated by focusing on a specific number on the scale, or even a task we must do to reach our goal (like working out), which is a pretty quick way to zap your motivation, says Simon Rego, Ph.D., director of psychology training at Montefiore Medical Center/Albert Einstein College of Medicine in New York. Concentrate on your mood after you've eaten a healthy meal or how you feel after a great workout—motivation doesn't always have to come before an activity, Rego says. "If you focus on how you feel each time you exercise, you'll get all the benefits of burning calories, plus the reinforcement of remembering how good it felt to do it, which should increase your motivation to do more."