The effectiveness of the self-regulation-based e- and m-health intervention 'MyPlan 2.0' on changing physical activity and sedentary behaviour in the adult population will be investigated. Furthermore, the role of three different behaviour change techniques (action planning, coping planning, self-monitoring) will be examined via a 2x2x2 design, in which 8 groups are created that all receive a different version of the intervention.
The aim of this study is to investigate the effectiveness of intervention 'MyPlan 2.0' and the efficacy of the different behaviour change techniques that are included. Eight groups will be created that will receive a different version of the intervention, varying in three behaviour change techniques (action planning, coping planning, self-monitoring).