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Background. Generalised anxiety disorder (GAD) is prevalent among older adults. These patients exhibit impaired response to cognitive behaviour therapy (CBT), and physical exercise has been recommended as a potential add-on intervention to improve efficacy. The current study is a randomised clinical trial that will compare CBT augmented with physical exercise, or CBT combined with attention placebo, and the current study assessing the feasibility of testing procedures and the experimental combined treatment measures. Methods. 4 participants were included in the feasibility study, and feasibility was assessed trough completion and attendance rates of testing and treatment sessions. Primary outcome measures were remission as assessed by an independent clinical rater using the Anxiety Disorders Interview Schedule for DSM-IV, and by symptom reduction on Penn State Worry Questionnaire. Manipulation check was assessed by physical tests of change in aerobic capacity and strength. Participants were measured on clinical, biological, physiological and neuropsychological tests at pre-, interim and post-treatment. Results. Completed treatment protocol for the RCT will be presented. 3 of 4 participants completed the full protocol including testing and the experimental augmented treatment. Participants completed 100% and 80% of CBT and physical exercise content, respectively. The three completers had large improvements on primary outcome and on manipulation checks. Conclusion. The testing procedures and experimental augmented treatment appear to be feasible. The preliminary findings indicate that this combined intervention can be efficacious.