Editorial on the Research Topic Exercise and childhood cancerGlobally, >175,000 children (i.e., individuals aged ≤18-21years) are diagnosed with cancer each year (1). For some of the most common cancers (e.g., acute lymphoblastic leukemia, non-Hodgkin lymphoma), medical advances have led to improved survival rates, with up to 85% expected to survive the disease for at least 5-years (1). 1 Despite improving prognoses, most children affected by cancer experience, or are at elevated risk, for numerous negative effects during and after treatment, with some effects observed decades later (i.e., late effects) (2). Health behaviors, including physical activity (any movement requiring energy expenditure) and exercise (structured or planned physical activity), may help this cohort manage the effects of their disease during and beyond treatment (3). In fact, based on a burgeoning evidence base, guidelines have recently been published suggesting that all children affected by cancer "move more" (4, 5).This Research Topic, Exercise and Childhood Cancer, includes 11 articles that collectively advance the field of "pediatric exercise oncology" ( 6), an area of study exploring physical activity, including exercise, for children affected by cancer. The articles included summarize the current literature, provide further evidence supporting the role of physical activity and exercise for children affected by cancer, and offer insights into forthcoming trials and novel approaches in the field.1 Prognosis varies across cancer types and is lower in middle-and low-income countries.