Physical activity is beneficial to health and wellbeing, but most older people do not do enough physical activity to maintain health or postpone disability. The ProAct65+ trial tested two interventions for increasing physical activity, one class- based (with exercise instructors)and one home-based (with peer mentors), against usual care. A total of 1256 older people were enrolled in the trial and followed up for two years after the end of the intervention period. This presentation will report on the outcomes at one year after interventions closed, and will discuss the difficulties in analysing and interpreting the findings. It will also discuss the validity of self-reported physical activity compared with objectively-measured activity.