This chapter presents a case study of Jemma, who is a primary school teacher working in a school in the suburbs of a large city. Jemma and her colleagues in the school would like to try to promote healthy eating and physical activity in their school. Jemma has been tasked with exploring what support there is in their area for promoting healthy eating and physical activity. It argues that public health works in three areas: health improvement, service improvement and health protection and that health promotion is involved in all three areas. Health promotion is about improving the health of communities as a whole and of the individuals within those communities. Health promotion is not solely or even predominantly focused on lifestyle behaviours but also includes issues such as: accident prevention, road safety, immunisation against infectious disease, food safety, support for individuals with learning disabilities to live in the community and supporting patients in adhering to medical advice and treatments.