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    Recovering strength and movement after an injuryoften involves physical therapy. Physical therapistshelp patients with brain or bone injuries regaincontrol of their muscles. Exercising muscles is animportant part of the rehabilitation process.Therapists use balls and boards to improve balance,stretchy bands to increase strength and other exercises.

　　But a Polish technology company Egzotech has developed a robot called Luna, to make thoseexercises interactive. Luna can help therapists choose the best exercises for their patients. Therobot also provides therapists with information about their patients' progress.

　　Luna uses electromyography, or EMG, to identify electrical currents as patients bend theirarms or legs. Michal Mikulski is the chief executive officer of Egzotech. He says detecting muscletension not immediately visible to the human eye can help therapists design better exercises.

　　"We reach a certain stage of disease development...when the muscle tension is not evenvisible. But these signals can still be seen on our machines. Luna is still able to detect them.And based on that, when the brain sends a signal to the muscle to flex, even though we don'tsee it, Luna is still able to detect it. It detects these signals and causes the movement of thelimb, as if it were performed naturally."

　　Luna can also make therapy fun for children who often get bored with repeated movements.Luna permits them to play games without knowing that they are exercising their muscles.

　　"Sometimes it is a spacecraft, sometimes shooting balls, sometimes flying a dragon. In anycase, a child wants to win a game, wants to compete, but in fact they are exercising."

　　Luna is just a prototype. But Egzotech expects to have other robots ready for sale later thisyear.

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