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Recovering strength and movement after an injury often involves physical therapy. Physical therapists help patients with brain or bone injuries regain control of their muscles. Exercising muscles is an important part of the healing process. Therapists use balls and boards to improve balance, stretchy bands to increase strength and other exercises. Now a Polish technology company, Egzotech, has developed a robot to make those exercises interactive. The robot is called Luna. It can help therapists choose the best exercises for their patients. Luna also provides therapists with information about their patients’ progress. Luna uses electromyography, or EMG, to identify electrical currents as patients bend their arms or legs. Michal Mikulski is the chief executive officer of Egzotech. He says detecting muscle tension not immediately visible to the human eye can help therapists design better exercises. We cannot see when the brain sends a signal to the muscle to flex or bend. Yet Luna is still able to detect it. Mr. Mikulski says the robot can recognize these signals and causes the movement of the limb, as if it were performed naturally. Luna can also make therapy fun for children who often get bored with repeated movements. It lets them play games without knowing that they are exercising their muscles. For example, the patient can shoot a ball. The robot is just a prototype — the first of its kind that has been made. But the Polish company expects to have other robots ready for sale later this year.