Do not do movements that encourage the upper vertebrae to move over the lower ones, such as lying on your back and hugging your knees to your chest or Balasana.
Strengthen the muscles that can provide support for the lower back area, including the paraspinals (the muscles on either side of the spine), hip rotators (muscles that connect the hip to the femur bone), abdominals and the leg and buttock muscles.
Avoid Down Dog, Natarajasana, any Back Bends, Spinal Extension, Percussive Activities (Running, Jogging, Jumping…), Rowing, Bowling, Cycling (these sports encourage the upper part of the body to slide forward over the lower part), high heels.
Do pelvic tilts, Koegals, Yoga Sit-ups, to strengthen the core and abdominal muscles, Supta Padangusthasana I, II and Parivrtta Supta Padangusthasana (with strap), Kneeling Lunge (keeping the knee that’s on the floor directly under the hip and tuck the tail), Parighasana (again, tail under), and Standing Twist at a wall (be sure the back is not over arched). Hope this helps. I am trained in Yoga for back care and scoliosis.