Intergenerational Behavioral Intervention to Enhance Physical Activity in Older Adults at Risk for Alzheimer's Disease

Main Participant Inclusion criteria: Men and women \> 60 years Who are current participants of the PREVENT-AD Longitudinal Cohort at McGill University. No contraindications to MRI Imaging. Normal cognition Not exercising more than 150 minutes of moderate-intensity exercise per week or sitting more than 8 hours per day AND responded "yes" to the question "Do you want to increase your physical activity?" Fluency in English or French Access to a computer or smartphone with internet Normal or corrected-to-normal vision based on the minimal 20/20 standard Ambulatory without significant increase in pain with walking or the assistance of walking devices Main Participant Exclusion Criteria: Primary care physician does not approve additional physical activity An inability to ambulate without the assistance of another person or severe pain Any unstable medical condition: * History of a psychiatric illness including schizophrenia or Attention Deficit Hyperactivity Disorder (ADHD). History of anxiety or depression accepted if stable on medication for at least 6 months * Current treatment for cancer - except non-melanoma skin cancer * Neurological condition (e.g., multiple sclerosis, Parkinson's disease, and stroke) * Current alcohol or substance abuse * Current treatment for congestive heart failure, angina, uncontrolled arrhythmia, Deep Venous Thrombosis (DVT) or other unstable cardiovascular condition * Myocardial infarction, coronary artery bypass grafting, angioplasty or other …