Inclusion Criteria:  18 years and older; living in the region of Erlangen-Nürnberg-Fürth, Germany; At least one of the following existing non-communicable diseases (controlled type 2 diabetes mellitus; cardiovascular diseases; obesity (BMI ≥ 30 kg/m2); arthrosis in knee and/or hip); Not meeting German PA recommendations (less than 150 minutes/week of moderate-intensity aerobic activity or less than 75 minutes/week of vigorous-intensity aerobic activity or any other equivalent combination); The person can safely participate in physical activities based on general practitioners' clinical judgment.  Exclusion Criteria:  The person plans to leave the region of Erlangen-Nürnberg-Fürth during the study period; The person participating in another study with similar content; The person is or plans to be absent for more than four weeks during the 12-week-intervention period; Person has cognitive impairments that prevent an effective communication with the general practitioner and the therapist; Persons with mental illness such as psychotic, substance abuse, mood, personality disorders; Unstable clinical situation or serious health impairments that prevent from undertaking physical activity safely (e.g., acute myocardial infarction, unstable angina pectoris, fever, terminal tumor diseases