Introduction
delirium, disability
Older adults (i.e., ≥ 65 years) are a rapidly growing demographic and represent the majority of people who have major surgery [Exercise prehabilitation (i.e., exercise therapy performed before surgery) has been identified as a promising intervention to address the vulnerability to physical and physiological stressors (disability, falls, delirium, serious illness, hospitalization) that individuals with frailty encounter [Theory-based behaviour change frameworks can be used to design interventions to improve adherence to target health behaviours, such as prehabilitation. A leading behavior change framework is the Theoretical Domains Framework (TDF) [