Impulsivity is the tendency to act with little forethought or consideration of the consequences(Eysenck, 1967) and includes a wide range of actions that lead to short-term rewards and risky outcomes. It is known to be associated with a variety of self-control problems among college students, such as smoking, drinking, internet addiction, etc. Former research has suggested that behavioral modification delivered as a college course helps students to reduce impulsivity (Choi & Chung, 2011; Kim & Chung, in preparation). In addition, physical exercise has been associated with improvements in impulsivity from another stream of research (Oaten & Cheng, 2006). It is presumed that both behavioral modification and physical exercise can be helpful intervention for improving impulsivity. However, there has been little effort made to investigate how exercise affects impulsivity of college students and to compare the effects of behavioral modification and exercise in a college setting. Therefore, this study aims to compare the effects of an exercise class vs. self-management class on impulsivity, habit strength, and behavior change.