The physical health benefits of exercise are well established but there is also growing research evidence of links between physical activity and mental health benefits, including mood elevation, better cognitive functioning and improved self-perception, self-esteem and selfefficacy. Physical activity has also been shown to enhance the effectiveness of psychological therapies and to have a role in improving quality of life and symptom management for people with a wide range of mental health problems. Physical activity has a double benefit, since people with mental health problems are also at increased risk of a range of physical health problems, including cardiovascular disease, endocrine disorders and obesity. However referral to a physical activity specialist is rarely available in psychiatric settings. This paper gives two examples of how provision of physical activity facilities and programmes staffed by qualified specialists can contribute towards improving mental health and quality of life for people with mental health problems.