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Little attention has been paid to the evaluation of the long‐term impact of theory‐based interventions on physical activity participation among overweight/obese individuals after the interventions have ended. The primary aim of this systematic review was to investigate the long‐term effectiveness of theory‐based interventions increasing physical activity and identify the most effective techniques for behaviour change among overweight/obese individuals. The secondary aim was to investigate the effect of these interventions on theoretical variables. Eighteen studies were reviewed. Among these studies, three reported significant short‐term and two long‐term effects of interventions on physical activity participation. Most of the studies observed a significant short‐ or long‐term effect of time on this behaviour. Theoretical frameworks most often applied included the Behavioural Model and the Social Learning/Cognitive …