[Correspondence] Reflections on daily steps and health outcomes

As researchers and epidemiologists working in physical activity surveillance, we read with great interest the Article by Ding Ding and colleagues.1 Their work has direct implications for informing how surveillance systems interpret steps-based data and informing the development of public health messaging to promote physical activity. Steps are a practical measure of physical activity: they are easy to understand, inclusive of all intensities, and increasingly measured and understood by individuals given the ubiquity of smartwatches capturing steps.