Read the following text and answer the questions.

Uncle Japanese

    One of my favourite coaches is Mr Arief Rahman. He is my coach in my in-line skate club. He is medium height, about 165cm tall. He has fair skin and slanted eyes. Because of his physical appearance, my friends and I call him Uncle Japanese. He doesn't mind that.

    Uncle Japanese teaches us how to be good skaters. He teaches us how to use our bodies effectively by moving our limbs correctly. He asks us to observe his movements and then tells us to imitate him. When we have difficulties, he helps us patiently.

    Uncle Japanese always comes earlier than us. He always inspects the track to make sure that it is safe for us to use. He is a disciplined man so he wants us to be disciplined, too. One day, I want to be a good coach like him, too.

"He teaches us how to use our bodies effectively by moving our limbs correctly." (Paragraph 2) The underlined word means ____ .