The purpose of this study is to see if exercise is helpful for improving memory, concentration thinking abilities, physical function, and quality of life for adults aged 50 to 89 years living with HIV and who have two or more cardiovascular disease risk factors. The study will test two kinds of intervention exercises: one group will walk for exercise and the second group will stretch for exercise. Members of both interventions will be asked to participate in one-on-one interviews/assessments, measures of physical functioning, and some sessions with others who are also enrolled in the study.