Physical activity (PA) is recommended to improve physical health in psychosis, however, most of them are inactive. The objective of the study was to assess the feasibility and efficacy of a four-week brief intervention to improve PA in men with psychosis and obesity. Feasibility, the participation and the drop-out intervention rate were evaluated. PA, sedentary time, and motivational processes of change and anthropometric measures were evaluated. Twelve men with psychotic disorders (75% with

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... izophrenia; age: 33.2 10.2, Body Mass Index: 35.8 7.7 kg/m2) were included. The participation rate was 32% and 100% of participants completed the intervention. Participants reported a high satisfaction rate towards the intervention. Following the intervention, an improvement in PA level was noted with a moderate effect size as an increase in behavioral processes of change was observed with a moderate effect size. Hence, the brief intervention was feasible and effective to improve PA level.