Inclusion Criteria:  Works at one of the relevant units regardless of occupational category, including administrative services. Permanent employment or fixed-term employment for at least one more year after the start of studies.  Exclusion Criteria:  Severe mental disorder such as ongoing mania, psychosis, and conditions when high risk of suicide or high risk of violence available according to the assessment of psychiatric staff at the unit. Medical conditions such as heart or lung disease, infection, abstinence where heart rate-increasing physical activity is considered contraindicated due to Medical reasons. Physical disability that makes it impossible to move independently to the gym and performing the indicated exercise in the training sessions. Mental disability which means that you can not participate in group training. Difficulty speaking or understanding the Swedish language. Ongoing heavy substance use. Full-time sick leave> 1 month during the training period