RecruitingBehavioural interventionOptimization of a Behavioral Intervention to Increase Physical Activity in Older Adults Living With HIVThe goal of this clinical trial is to examine 3 interventions designed to increase physical activity in older adults with HIV. We will examine 3 potential components of an intervention package: physical activity coaching, cognitive behavioral therapy targeted toward common barriers to physical activity such as low motivation or chronic pain, and a Fitbit-based social support intervention. Our primary outcome will be physical activity, defined as steps per day. Results will guide choice of intervention components to be used in an optimized behavioral intervention.