Inclusion Criteria:  1) diagnosed with HIV, 2) receiving the same ART for at least six months, 3) being clinically stable (i.e., no recent AIDS-defining opportunistic infections, a CD4+ T-cell count ≥ 200 cells·mm-3, and asymptomatic), 4) owning a smartphone with text message capabilities, and 5) willing to receive four or more text messages per week.  Exclusion Criteria:  1) having a diabetes mellitus diagnosis 2) requiring the use of an assistive device for walking as it will impair physical activity, 3) participating in any sport or planned exercise program on more than two days per week 4) having any signs or symptoms of CVD or any known uncontrolled cardiovascular, pulmonary or neuromuscular disease that may preclude exercise participation, 5) severe arthritis, hip or knee fracture or spinal surgery in the past 6 months 6) having any contraindications to exercise as identified by the American College of Sports Medicine