Generally, they should exercise three to five times a week unless they are having problems. Swimming is another form of exercise that is especially good for cardiac surgery patients. It is a cardiovascular exercise that is not hard on the joints, so it will often be kept up longer. The only thing to remember is that all wounds must be completely healed first. Yet, it is important that the clinic is not just hiring anyone who walks in off the street. While physical therapy aides can help with certain treatment tasks, it is the physiotherapist that assesses the condition of the patient. This person also plans the course of treatment and specific treatments like special exercises. Since there was no one to come to his aid, Alexander began watching his every move. He spent much time looking into mirrors, trying to determine what he might be doing wrong. Over a period of nine years, he came up with a solution: the Alexander Technique. The system Alexander designed did the trick of restoring his voice. This allows work to go on at home with an example of each exercise. Range-of-motion exercises are done by a caregiver, who moves the limbs so that they will not become set in one position. For spinal cord injury patients who are not quadriplegics, there is physiotherapy using mats. These mats are raised off the floor, and can be operated by a hand crank or a power system. If left to their own devices, they will cripple the limb further by letting it atrophy through nonuse. Physiotherapists use stroke rehabilitation to make sure that patients do indeed work to use their impaired limbs. They can do this in a number of ways. Sometimes it helps for the physiotherapist to tap or stroke the limb they want the patient to use. Both of these are neurological diseases that can be helped by physiotherapy. MS, another of the neurological conditions that affects the brain and spinal cord, can lead to a long, slow decline. Parkinson's disease is another of the neurological conditions of the brain. This one can cause shaking and loss of coordination, and problems moving and walking.