Chemtob K, Reid RER, de Fátima Guimarães R, et al. - Researchers conducted this longitudinal analysis to describe adherence to the guidelines and their cross‐sectional and longitudinal correlations with adiposity from childhood to adolescence. Children at 8 to 10 years (childhood; n = 630), 10 to 12 years (early adolescence; n = 564) and 15 to 17 years (adolescence; n = 377) were followed. Physical activity, screen time, and sleep duration have been measured by accelerometry and questionnaires. In childhood, early adolescence and adolescence, 14%, 6%, and 0% of candidates met the 24‐hour movement guidelines, respectively. Few participants have fulfilled the requirements. Not meeting the guidelines in childhood is linked to higher adiposity 2 and 7 years later. Interventions are required to increase adherence to the 24‐hour movement guidelines across childhood and adolescence.