Authors' response to Letter to the Editor: ANZJPH‐2017‐248

The letter from Bright and colleagues highlights the importance of continuous and consistent national surveillance systems to monitor population physical activity. It is a major strength that the ABS has included a consistent set of questions for more than 20 years in the Australian National Health Survey, even though the conceptualisation of physical activity has evolved to encompass more than just fitness and exercise. It should be noted that the National Health Survey has expanded over the years with the inclusion of other supplementary measures of physical activity (e.g. walking, sedentary behaviour).1