Individuals arrive to CR with various cognitive, personal, emotional, and social resources that allow them to participate actively, collaboratively, and efficiently in the rehabilitation process. Sometimes individuals exhibit patterns of behavior that disrupt the provision of services and/or medical care, and this can negatively impact patient outcomes for that patient or cohort mates. Research on barriers that influence participation in CR has identified intrapersonal (person-specific) factors, among others. Studies have suggested that program directors and physicians commonly cite perceived lack of patient motivation and commitment as an intrapersonal barrier to the rehabilitation process, yet CR patients consistently report preventative services as a high priority in their healthcare plans. Elevated anxiety sensitivity leading to fear of exercise also hinders participation in CR, particularly when patients perceive prolonged bouts of exercise as more effortful or uncomfortable. Fears of negative consequences from exercise may be especially pertinent when CR programs are serving more patients with post-COVID syndrome, on which research is currently limited but appears to include increased risk for anxiety sensitivity and decreased functional capacity. Finally, hostility is a known psychosocial risk factor for morbidity and mortality in cardiopulmonary patients; patients may present to CR with irritability, distrust, and/or agitation, which can be difficult for CR staff to manage. There have been anecdotal reports of COVID-specific problematic behaviors related to anger and hostility, such as rebelling against safety protocols. The purpose of this presentation is to examine three categories of problematic intrapersonal behaviors (i.e., nonadherence, exercise avoidance, and hostility) commonly encountered in the CR setting, better understand the potential etiologies of these behaviors, and learn practical management strategies to improve patient outcomes.