Inclusion Criteria:  AIS diagnosis Risser 0-2 Primary curve angles 20 degrees - 40 degrees If female, either premenarchal or less than 18 months postmenarchal.  Exclusion Criteria:  Patients with a pre-existing cardiovascular condition Patients with a symptom of a neurological disorder Patients with any other disorder of the musculoskeletal system affecting the lower limbs Pregnancy