Inclusion Criteria:  achieve a score ≥18/30 and ≤24/30 on the Montreal Cognitive Assessment have subjective cognitive impairment based on interview have no significant impairment in daily function, as determined by a score ≥6/8 on the Lawton and Brody Instrumental Activities of Daily Living Scale no diagnosis of dementia aged 65 to 80 years old live independently in their own home live in the Greater Vancouver area read, write, and speak English with acceptable visual and auditory acuity are cleared to start a supervised exercise programme based on the Physical Activity Readiness Questionnaire for Everyone able to walk independently able to provide informed consent  Exclusion Criteria:  participating in regular moderate to vigorous intensity aerobic exercise in the last 3 months planning to enroll in a concurrent exercise or drug trial targeting cognitive function diagnosed with a neurological, cerebrovascular, or psychiatric disease, or other chronic medical condition requiring intensive treatment and monitoring have major impairments in eyesight, hearing or motor movements have clinically significant neuropathy or musculoskeletal or joint disease have a recent traumatic brain injury, including concussions are currently using prescribed cognitive intervention or electromagnetic stimulation at the time of recruit, indicate they recently (within the last 2 months) or will start taking drugs that significantly alter cognition, movement, or affect, such as cholinesterase inhibitors, anticholinergics, hormone replacement therapy, or antidepressants