Aims: The study aims to explore (1) the perspectives of health professionals on increased attendance of physical therapists (PTs) and occupational therapists (OTs) in clearly defined work assignments in two in-hospital departments and (2) the perspectives of geriatric patients on physical activity during hospitalization. Methods: A mixed-methods study using a focus group interview and a questionnaire in assessing the impact of an intervention on increased attendance of PTs and OTs in clearly defined work assignments. The patients’ perspectives on physical activity were explored in one-on-one interviews. Results: The health professionals reported that the intervention led to a higher degree of patients’ mobilization, increased collaboration, improved the health professionals’ competencies, and provided more time for monodisciplinary assignments. The six patients stated that encouragements promoted physical activity. Conclusions: Increased attendance of PTs showed a positive impact on both the patients’ level of physical activity and the health professionals’ monodisciplinary assignments.