The Global Recommendations on Physical Activity for Health is focused on primary prevention of noncommunicable diseases (NCDs) through physical activity at population level, and the primary target audience for these recommendations are policy-makers at national level. The recommendations set out in this document address three age groups: 5–17 years old; 18–64 years old; and 65 years old and above. A section focusing on each age group includes a narrative summary of scientific evidence, the current physical activity recommendations, and the interpretation and justification for the recommendations made.