Inclusion criteria:  Proficient or native speakers in French; Computer literate defined as being able to read mails and browse the Internet, and having access to a computer, smartphone or tablet with an Internet connection; Committed not to participate in another program related to any of the three intervention domains for the duration of the trial;  At least one of the following:  Low cognitive engagement in cognitively stimulating activities, defined as a score ≤ 22 on the adapted Cognitive Activity Questionnaire; Low level of physical activity defined as less than 150 minutes/week) of moderate to vigorous physical activity measured using the Godin-Shephard Leisure Time Physical Activity Questionnaire, and no medical contraindication to physical activity based on the Physical Readiness Questionnaire for Everyone (PAR-Q+); Low adherence to the Mediterranean-type diet defined as a score of ≤ 8 on the adapted Canadian Mediterranean Diet Scale, and no severe food allergy or intolerance or history of eating disorder.  Exclusion Criteria:  Presence of a cognitive impairment as measured by the Cogstate Brief BatteryTM. General anesthesia within the last 6 months; Participation in any previous validation studies related to the program; Participation, currently or within the last 6 months, in a program where they received any of the three interventions; Unable to commit participation over the period of the study. Participants in the precontemplation stage of change. Participants with a high level of perceived stress;  Having received a diagnosis of:  Dementia or neurodegenerative disease (AD and other dementias); Past or present neurological disorder (multiple sclerosis, brain tumour, epilepsy, stroke, traumatic brain injury); Severe psychiatric disorder (schizophrenia, major depression, bipolar disorder); Uncontrolled cardiovascular or metabolic diseases; Alcoholism or drug addiction; Any other conditions expected to limit participation (e.g., visual acuity).