Background: Physical activity (PA) is important for the long-term health and weight management of patients who undergo metabolic and bariatric surgery (MBS). However, the roles of exercise professionals in clinical MBS settings have not been systematically determined. Objectives: To investigate: (1) who are the professionals implementing PA programming in MBS clinical settings; and (2) what patient-centric tasks do they perform? Setting: Clinical and academic exercise settings worldwide. Methods: This is a multimethod study. A systematic literature review of all bariatric PA programs was conducted. Data about job tasks were extracted, reduced and provided to a panel of 10 experts to sort into categories. Cluster analysis was utilized to find the hierarchical structure of tasks. A Delphi process was used to agree on a final model, and then the literature was recoded for higher order job task categories. Results: The majority of PA professionals were exercise physiologists in the USA and physiotherapists or other types of exercise professionals elsewhere. Forty-three tasks were identified, the most reported being: supervision of exercise, fitness testing, and exercise prescription. Higher-order categories were: (1) Exercise-related health assessment, (2) Body composition and physical fitness assessment, (3) Lifestyle physical activity and sedentary behavior assessment, (4) Education, instruction, and prescription, (5) Exercise monitoring, (6) Behavioral counseling and psychosocial support, and (7) Dietary support. The most common skills reported in the literature were: supervision of exercise, fitness testing, exercise prescription, heart rate monitoring, and physical activity counseling. The following statements were rated an average of 9.0, indicating "imperative" was indicated by all respondents: 1) "Pre- and post-operative PA/exercise guidelines for bariatric surgery patients are needed", 2) "Bariatric surgery programs need to include PA/exercise as part of multidisciplinary care". Conclusions: Our expert group of bariatric exercise professionals, allied clinicians, and scientists reached a consensus on 7 major classifications of job tasks for the exercise professional. It is important for governing medical associations across the world to formally recognize experienced exercise professionals as playing pivotal roles in continuing, multidisciplinary care for bariatric surgery patients. These findings provide evidence-based guidance on how to solidify these positions within the greater context of healthcare.