Inclusion Criteria:  Sedentary >60 year-old in the elderly group or >50 year-old for the PLWH group; with sarcopenia, as defined by both relative loss of muscle mass by bioimpedentiometry (BIA) and low muscle strength by handgrip  Exclusion Criteria:  Any disease requiring hospitalization in the 6 weeks before enrollment; Medical conditions contraindicating the proposed exercise as established by a sport medicine specialist; Current substance or alcohol abuse or use of drugs that may influence balance and coordination; Not being able to walk without assistance and to perform the prescribed exercises as by protocol.