Susan Liu is the health care professional trained to perform and teach exercises that can help maintain muscle function and prevent joint stiffening. She has received special training in measurement and stretching techniques for DMD care. She performs NSAA and records timed function tests. Clinical trial patients are seen differently from clinic in the CDMD Clinical Trials Assessment Group in the Rehabilitation Building. Clinical trial outcomes, in some instances, may be used clinically as well. There is also availability for Duchenne patients, to a warm water pool program at UCLA that was initiated between the Department of Recreation and the PT services of the CDMD.