Inclusion Criteria:  Not exceeding 60 total minutes of physical activity per week Access to computer or mobile device with high speed internet connection  Exclusion Criteria:  History of myocardial infarction, angioplasty, coronary artery bypass, cerebrovascular ischemia/stroke, symptomatic congestive heart failure, atrial flutter, unstable angina, or unstable pulmonary disease; pacemaker; history of alcoholism, drug abuse or other psychiatric problems; current use of tricyclic antidepressant or clozapine medications; type 1 diabetes; orthopedic or rheumatologic problems that could impair the ability to walk.