The investigators now intend, in a randomized controlled study, to compare training in an activating spinal orthotic with training in an equipment training group, led by a physiotherapist, to see if positive results can be obtained in reduced back pain, increased muscle strength in back extensor muscle, increasing mobility, and decreased kyphosis in the thoracic and lumbar spine. It can also lead to improved lung capacity, and further increased health-related quality of life. If the training method in the activating spinal orthotic appears to work, it would improve the possibilities to train and treat patients with osteoporosis, vertebral fractures and back pain.