Inclusion Criteria:  Age 60 to 90 years old. Has a Family Physician Has internet access (and have regular access to email), and the technology ability (able to send and receive emails). Resides in their own home/apartment in the community. Has access to a home computer and/or a tablet computer device. Self-reported levels of proficiency in English and/or French for speaking and understanding spoken and written language. Able to comply with scheduled home-based assessments, interventions, and other trial procedures. Able to ambulate at least 10 m independently with or without a walking aid.  Being at risk of developing dementia:  Mild Cognitive Impairment (MCI) Group. Diagnosis of Mild Cognitive Impairment, in accordance with the criteria used in the Comprehensive Assessment of Neurodegeneration and Dementia (COMPASS-ND) study2 (Table 1). Subjective Cognitive Impairment (SCI) Group. Diagnosis of Subjective Cognitive Impairment, in accordance with the COMPASS-ND study2 definition (Table 1).  Cognitively Intact with Risk Factors Group. Cognitively Intact based on COMPASS ND study2 definition (Table 1)) AND have a history of two or more risk factors for dementia, defined as the following (Table 1):  Obesity: Defined as a Body Mass Index (BMI) > 30 kg/m2 (as derived from the National Institute of Health BMI calculator52) Hypertension: Defined as a documented Systolic Blood Pressure > 140 mm Hg, OR a physician's diagnosis of hypertension, OR presence of physician prescribed medical treatment for hypertension, OR other approaches to treatment for hypertension (i.e., diet or exercise). Diabetes: Defined as a physician's diagnosis of diabetes, OR presence of physician prescribed medical treatment for diabetes, OR other approaches to treatment for diabetes (i.e., diet or exercise). Cardiovascular disease: Defined as a physician's diagnosis of angina, myocardial infarction, coronary revascularization or other arterial revascularization, stroke, transient ischemic attack and/or peripheral vascular disease. Physical inactivity: Defined as inactive, whereby active is defined as engaging in a minimum of 20-30 minutes of physical activity causing sweating and breathlessness, at least two times per week. First-degree family history of dementia: Defined as a physician's diagnosis of dementia in a first-degree relative, including a parent, sibling, or child. Dyslipidemia: Defined as a documented total cholesterol > 6.5 mmol/L, OR a physician's diagnosis of hypercholesterolemia, OR presence of physician prescribed medical treatment for hypercholesterolemia, OR other approaches to treatment (e.g. diet, exercise). Poor sleep: Defined as a score of 6 or higher on the PSQI-18 (higher scores indicate poorer sleep). Poor diet: Defined as a score of 7 or less on the MDA-14. Must be medically able to participate in the study's exercise training program, as determined using the Get Active Questionnaire (a screening tool developed by the Canadian Society for Exercise Physiology53), coupled with evaluation by a certified exercise physiologist and/or the study physician for clearance to participate in combined exercise training program. Preserved activities of daily living operationalized as a score of > 14/23 on the Lawton-Brody Instrumental Activities of Daily Living (IADL) scale3 and confirmed by clinician's interviews.  Exclusion Criteria:  A diagnosis of dementia Participants living in Nursing Homes or Adult Residential Facilities (Special Care Homes) will be excluded. Serious underlying disease, which, in the opinion of the study physician excludes engagement in interventions or may interfere with the participant's ability to participate fully in the study. Has had surgery within the last two months or has planned surgery in the coming 12 months that, deemed by the study physician, could interfere with the participant's vision, hearing, mobility or any other ability to participate in the study. Has a history of intracranial surgery. Regular Benzodiazepine use by a participant that the study physician determines to be significant enough to interfere with the participants ability to participate in the assessments and interventions in the study will be excluded. Presence of major depression, schizophrenia, severe anxiety or drug/alcohol abuse, or other medical illness that would prohibit them from safely participating in the study or may cause harm to the participant. Current Parkinsonism or any neurological disorder with residual motor deficits (e.g. stroke with motor deficit), active musculoskeletal disorders (e.g. severe osteoarthritis of lower limbs), or history of knee/hip replacement affecting gait performance during the baseline assessment. Severe visual and/or auditory impairment, which, according to the vision and hearing assessment, precludes the participant from engaging in the trial. Intention to enroll in other clinical trials during the same time period. Active participation in an organized and planned exercise program involving aerobic exercise and/or resistance training regimen in the previous 6 months.