The lower back contains the lumbar spine and the pelvis. The lumbar spine is comprised of vertebral bodies, discs, spinal cord, ligaments and muscles, to support the body weight and provide flexibility. The lumbar spine is curved inwards (lordosis) to connect the spine to the pelvis and provide an upright posture. The lower back is a common site of injury due to poor posture, muscle imbalance and disc problems.

Above: Conditioning exercises for the lower back supervised by experienced therapist
The most common lower back injuries the physiotherapists at Physio.co.uk see are:

Above: Progressive strengthening exercises for the lower back supervised by an experienced therapist

Above: Soft tissue massage of the lower back muscles and connective tissue by specialist therapist
Other less common injuries include:

Above: Soft tissue massage of the lower back muscles and connective tissue by specialist therapist