Inclusion Criteria:  Adult aged 60 and older, Normal or corrected vision and normal hearing for their age range, No cognitive impairment (Mini-Mental State Examination - MMSE ≥ 25), Inactive (< 150 min of physical activity per week).  Exclusion Criteria:  MMSE ≤ 24 or diagnosis of dementia, Uncontrolled psychological / psychiatric condition within the past 6 months, Neurological disease, Severe exercise intolerance, Respiratory disease (e.g., asthma, COPD), Excessive alcohol consumption (> 15 drinks/week), Documented cerebral, peripheral or coronary atherosclerotic disease, Chronic systolic or diastolic heart failure, Symptomatic aortic stenosis, Atrial fibrillation, Automatic implantable defibrillator or permanent pacemaker, Malignant exertional arrhythmias, Non-cardiopulmonary limitation to exercise (e.g., arthritis).