The “freshman 15” is a myth. However, 90% of college first-year students gain at least 2 pounds during their first year. Only 50% of college students meet exercise guidelines, possibly contributing to weight gain. Paying first-year students to go to they gym might help them establish exercise habits. To find out, we conducted a serious study by randomizing 117 first-year students to three conditions; Control, Discontinued-Incentive, and Continued-Incentive. We then subjected all three groups to a “money fairy,” who taunted the control group, and made life “interesting,” for the incentive groups. This is what happened . .