Conclusions
In summary, we demonstrate that two methods of delivering Behavioural Activation are feasible and acceptable, with both showing promise in improving activity levels and mood relative to Waitlist Controls in a high-quality randomised controlled design. Benefits of the interventions outweighed reported harms. “Traditional” BA seems to affect motivational processes and enhance confidence relative to “Experiential” BA. Further delineating how group processes contribute to activity levels and mood, and methods of facilitating group cohesion in future intervention studies, is warranted .