Social Exergaming for Healthy Weight in Adolescent Girls

Inclusion Criteria: * Age 14-18 years old * Female * Postmenarchal * BMI percentile equal to or greater than 85th on the U.S. Centers for Disease Control and Prevention growth chart * Speak, understand, read, and write English * Willing to accept randomization Exclusion Criteria: * Pregnant * Hospitalization for mental illness within the past 5 years. * Since the focus herein is on ambulatory activities, participants who use wheelchairs or other impairments that prevent normal ambulation will be excluded * Indication of cardiac abnormality on an electrocardiogram that requires referral to a cardiologist * Previous history of, or clinical symptoms or signs of, cardiovascular disease, stroke or transient ischemic attacks, chest pain, unusual dyspnea during physical activity/exercise, severe ankle edema, or intermittent claudication. * Previous history of musculoskeletal injuries or problems causing severe pain during physical activity or exercise which interferes with daily activities. * Participant has a pacemaker or other implanted medical device (including metal joint replacements). * Participant is unable to complete all baseline testing (one session) within 1 month prior to the beginning of the intervention * Medical problems, including epileptic seizures, that prevent video game play * Family history of epileptic seizures * Unable to make the commitment of coming to Pennington Biomedical Research Center for 3 weekly gaming sessions for 12 weeks