The WHO has launched a global action plan on physical activity and health. Worldwide, one in five adults and four out of five adolescents do not do enough physical activity. Girls, women, older adults, poorer people, people with disabilities and chronic diseases, marginalised populations, and indigenous people have fewer opportunities to be active. Regular physical activity is key to preventing and treating non-communicable diseases (NCDs) - such as heart disease, stroke, diabetes and breast and colon cancer - which are responsible for 71% of all deaths globally. The action plan calls for training health-care workers and other professionals, stronger data systems, and the use of digital technologies. On 27 September world leaders will meet to take action on physical inactivity and mental disorders at the third UN General Assembly high-level meeting on NCDs in New York.