Daily Activity Study of Health: Increasing Physical Activity in Aging

Inclusion Criteria: * Age range 60-95 * Not exercising more than 150 minutes of moderate/vigorous intensity per week AND sitting more than 8 hours per day * No contraindications to MRI (if opting for MRI) * Being able to speak English fluently * Body Mass Index (BMI) between 20 and 40 * Normal or corrected-normal vision based on the minimal 20/20 standard * Ambulatory without severe pain or the assistance of walking devices * No diagnosis of a neurological disease * Regular access to a computer with internet or smartphone Exclusion Criteria: * Primary care physician does not approve additional physical activity * Inability to ambulate without assistive device * Any unstable medical condition * Current diagnosis of a Diagnostic and Statistical Manual of Mental Disorders (DSM-V) Axis I or II disorder including Major Depression * History of major psychiatric illness including schizophrenia (not including general anxiety disorder or depression) * Current treatment for cancer - except non-melanoma skin * Neurological condition (multiple sclerosis, Parkinson's disease, dementia, mild cognitive impairment) or brain injury (traumatic or stroke) * Current alcohol or substance abuse * Current treatment for congestive heart failure, angina, uncontrolled arrhythmia, deep vein thrombosis or other cardiovascular event * Myocardial infarction, coronary artery bypass grafting, angioplasty or other cardiac condition in the past year * Not passing the Telephone Interview of Cognitive Status (TICS) as normal * Use of any anti-psychotic, anti-depressant, anti-anxiety, and attention deficit disorder (ADD/ADHD) medications.