The document outlines a communications campaign aimed at encouraging Britons aged 40-65 to reduce sedentary behavior to prevent becoming NHS patients, emphasizing that inactivity poses greater health risks than obesity. It highlights the significant health consequences of excessive sitting, including increased risks of various diseases and premature death. The campaign seeks to change the social norm surrounding sitting by promoting activity through an engaging approach and introducing a desktop widget that tracks and compares sit-stand durations among users.