For low back pain should I be doing strength exercises or flexibility exercises?

According to a recent study by Aleksiev the type of exercise, strengthening or flexibility, does not matter. Both caused a similar pain decreasing effect for patients with low back pain over a ten year period. The most important aspect of the exercise, according to this study, was the frequency, the more the better. It was also shown in this study that the use of an abdominal brace during daily whole-body movements or exercises also further increased the pain reducing effect of exercise over a ten year period.