'One, two, three, hands up!' Yeung Kim-ping cries out, dancing in time to the music with her students, who turn, jump, smile and wave red flags in their hands. The nine students belong to the Dancing Heart Troupe, which was set up in 2000 to teach mentally impaired people to dance and so lead richer lives. The troupe took to the stage at the Hong Kong Academy for Performance Arts last month. 'Some people might think they can't understand the meaning of dancing, and simply go through the motions,' Ms Yeung, 41, said. 'But they can understand it, and even better than we do.' The Beijing-born teacher came to Hong Kong 20 years ago and started teaching dance two years ago. Her daughter also teaches the troupe. 'I often told my daughter how simple and strong the impaired people are. Normal people tend to consider them as poor and tragic, but actually, they are not. They are much happier in their own world than we are.' She says she was moved when she saw them perform one of their dances, titled Missing. 'You can tell their feelings by watching them dance, more truly than with normal dancers,' Ms Yeung said. As the teacher, she said she was more nervous than anyone when watching the performance. She also says other young people can learn from her students. 'Normal children are too soft and lazy to learn dancing. They have too many other temptations and are too easily tired, and they give up. My students never stop practising until I tell them to.' 'They are pure-hearted. Normal people always worry when they are dancing - wondering whether they look nice and whether people are looking at them. These things never bother my dancers.' she said. Ms Yeung says she does not have difficulties communicating with her dancers. 'As dancers we don't talk much. We just get along very well. It is not only themselves they show in their dancing, but also the trust they place in me.' She was deeply moved one day when her students heard her hoarse voice and asked her to rest. 'They may not be good at expressing themselves, but all they tell you is true. On the other hand, relationships with normal people are often complicated. I think this is what keeps me working here.' Carol Sang, mother of one of the students, says she is grateful for Ms Yeung's efforts. 'My daughter always told me how beautiful Ms Yeung was,' she said. 'It is the teachers who give the children happiness and hope.'