Adults with chronic low back pain and at least 4 months of decreased work participation. Intervention as for all groups but with the use of GLADRyg back rehabilitation principles.

Adults with COPD (FEV1<80%). Intervention as for all groups but with added pulmonary rehabilitation focus.

Adults with type 2 diabetes and diabetes-related challenges including dysglycaemia, diabetic complications and/or weight issues. Intervention as for all groups but with added focus on how to make useful microchoices in terms of lifestyle.

Young adults (18-35 years) with mixed anxiety/depression. Intervention as for all groups but with added focus on "acceptance and commitment therapy", behavioral analysis, metacognitive therapy and physical activity.

All arms receive a concentrated interdisciplinary rehabilitation with similar focus and structure:

Three phases:

1. Pre-intervention preparation (1-2 months): mobilize the patients' resources for change
2. Concentrated group intervention (2-5 days): (further described below)
3. Post-intervention follow-up (1 year): digital follow-up

The core intervention is based on the concentrated rehabilitation format:

1. Initiate treatment when the patient is ready for change
2. Focus on the behavioral patterns which maintain the disorder, identify situations where they can break the patterns ("micro-choices").
3. Assist the patient when breaking the patterns.
4. Use long sessions to ensure that they face a broad range of potential micro-choices
5. Work side-by side with others going through an analogous pattern of change
6. Prepare them for taking responsibility for integrating the change into every-day living

Percentage of participants who are eligible for participation, who complete the 1 year programme

The Client Satisfaction Questionnaire (CSQ-8) is an 8-item questionnaire that measures patient satisfaction with health services, where the items are rated from 1 (very low satisfaction) to 4 (very high satisfaction). The total score ranges from 8-32, with higher scores indicating higher degree of satisfaction. The CSQ-8 has good psychometric properties, with high internal consistency (Cronbach's α = .93), and high inter-item correlation.

Changes (absolute levels and %) in cognitive and emotional representations of illness before, 3, 6 and 12 months after the intervention, as measured through the generic questionnaire The Brief Illness Perception Questionnaire (Brief IPQ). This is a 9-item questionnaire designed to assess cognitive and emotional representations of illness. Questions are graded from 1 to 10. The last item deals with perceived cause of illness, in which respondents list the perceived three most important causal factors in their illness. For this questionnaire, the general word 'illness' can be replaced by the name of a particular illness. The word 'treatment' in the treatment control item can be replaced by a particular treatment such as 'surgery' or 'physiotherapy'.

Changes (absolute levels and %) in patient activation before, 3, 6 and 12 months after the intervention, as measured through the generic questionnaire Patient Activation Measure (PAM-13). This is the shortened version developed by Hibbard et al in 2005. Each question replied categorically as either disagree strongly, disagree, agree, agree strongly or N/A. These are further scored and summarized, yielding a 0-100 score, where higher score indicates higher degree of patient activation. The questionnaire is widely used, with high internal consistency (Cronbach's α = .91).

Changes (absolute levels and %) in level of everyday function before, 3, 6 and 12 months after the intervention, as measured through the generic questionnaire Work and Social Adjustment Scale (WSAS). This short (6 item) questionnaire allows participants to grade their level of functioning on a 9-point scale, ranging from severly impaired to not impaired. The scale is widely used, and according to studies provide high internal consistencies ranging from Cronbach's α 0.70 to 0.94.