The study at hand reports on the findings of the evaluation of the MoVo-Lisa intervention program, which is based on the MoVo-Processmodel (Fuchs, 2007) implemented on a sample of people diagnosed with psychopathological symptoms. The application of motivational and volitional strategies is aimed to change daily physical activity basis. The intervention consists of two group sessions, a one-on-one session and a telephone interview and was aimed at developing an idea about motion, an individual plan of motion and personal barrier management. All in all, 350 patients of a psychosomatic ward were investigated for their physical activity. 258 individuals were found to be physically inactive, where of 59 volunteered to for the intervention group and 58 for the control group. The evaluation was conducted over a timespan of six months with four distinct measurement moment. At each measurement moment the participants answered questions about physical activity, state of health, and psychological mediator variables. The measurement moments were before, after the treatment, 6 weeks, and 6 months after discharge. Additionally, the BSI (Brief Symptom Inventory) was conducted to measure the psychopathological symptoms of the participants. The results show statistically significant main and interaction effects on the mediator variables self-efficacy, depth of planning, and self-regulation. For all other mediator variables the physical activity improved within both groups over the evaluated period, while no intervention effect was detectable. The BSI indicated a statistically significant higher occurrence of psychopathological symptoms in the intervention group than in the control group. This group difference of psychopathological symptoms may account for the difference of the results in the study at hand to previous studies. ^Correlations between the mediator variables and subscales of the BSI suggest an enhanced alertness with treatment measures, to alteration of the mediator variables.