There are many causes of low back pain, but often it is the result of poor hip and low back flexibility, muscular imbalances of the deep back muscles (Multifidi) and deep abdominal muscles (Transversus Abdominis), as well as biomechanical imbalances in the actual structures of the spine. Although Yoga cannot change the biomechanical imbalances in the spine, it can create balance between the flexibility and strength of the back and lower extremities to help reduce low back pain symptoms and minimize the recurrence of these same symptoms in the future.

There are various types of Yoga which can range from very gentle and spiritual to very challenging and rigorous. In order to target low back pain, the best type of Yoga would be one that focuses on improving posture, flexibility, and balance, as well as gently increasing core strength. Hatha Yoga is an ideal practice to start with, it is gentle and focuses on these key target areas. It helps develop awareness of proper posture, alignment and form and gently improves core strength. Practices such as Asthanga, Bikram and Kundalini may be too challenging for people suffering from low back pain symptoms. 

Prior to starting any exercise routine including Yoga, it is important to be examined and cleared for exercise by a physician and/or physical therapist. It is a good idea to speak to the Yoga instructor about specific symptoms and limitations, as he or she can tailor the movement and positions to individuals' current abilities with the use of props (straps, blocks, chairs, etc). It is also important to look for an instructor who has experience teaching students with back and neck pain. 

In general, a good rule of thumb is: Listen to your body in respect to pain and know your limits.