Inclusion Criteria:  of age ≥18 years; either sedentary or already practicing mild/moderate physical activity (at least 150 minutes of moderate-intensity physical activity throughout the week); able to sign the informed consent.  Exclusion Criteria:  The study will exclude HIV+ individuals:  with any HIV-related disease requiring hospitalization in the 6 weeks before enrolment; with medical conditions (e.g. neurologic, muscular-skeletal, cardiovascular diseases) contraindicating non agonistic exercise, as established by a sport medicine specialist; currently abusing of substance or alcohol; already performing physical activity at higher level than the current WHO recommendations (30 minutes of moderate activity 5 times a week).