The physical activity and sedentary behaviour guidelines released by the World Health Organization (WHO) in 2020 are a major step forward in helping people to maintain their physical health and well-being. The guidelines provide clear recommendations on how much physical activity is needed for different age groups, as well as advice on reducing time spent sitting down. They have been developed by an expert panel of physiotherapists, public health experts and scientists, and will be of use to everyone from individual exercisers to national governments.