According to my orthopedist, the best exercise or physical therapy for scoliosis is swimming. Physical, strenuous activities that involve bending your back like weightlifting and sit-ups are NOT ALLOWED. He also recommended a therapy exercise where I would stretch my back for 10 minutes on each side on my bedpost every night. Moreover, he strongly advised me to be wary of my posture in everything I do especially in sitting (for long hours), standing, and walking. Because the degrees were so high, he urged me to wear a Milwaukee brace for two whole years.
Life Begins At Twenty 