In this edition, a series of papers focus on early mobilisation of patients in the intensive care unit (ICU). Interest in this intervention has been spurred on by the recognition that many ICU patients experience muscle wasting, sometimes termed ICU‐acquired weakness.1, 2 One review identified that, depending on the ICU population, ICU‐acquired weakness occurs in 24% to 67% of patients.3 Early mobilization is one strategy used to try to prevent this occurrence. It has been defined in various ways2 but generally reflects ventilated patients' active participation in exercises, meaning they are using their own muscle strength and control.4 Importantly, what this active participation may entail, including the treatment goals and activities, varies widely across studies,2 which is important to keep in mind when considering the beneficial effects of early mobilization.