Although only a small percentage of older adults engage in habitual physical activity, previous studies have demonstrated interventions that include cognitive-behavioral strategies can enhance long-term, independent physical activity. In addition, there are episodic charity events, such as charity walks, that attract large numbers of participants of all age ranges to engage in moderate-intensity physical activity. These actions are a form of prosocial behavior, defined as voluntary, intentional behavior that results in benefits for another. The opportunity to help others seems to be a motive in inspiring these individuals to at least engage in one session of moderate physical activity. Thus, the current research project contemplates whether prosocial behavior may be implemented as a viable behavioral incentive for long-term physical activity.