For musical instrument training such as guzheng, you can find some girls under the age of 25 and say: beauty/little beauty, you have a good temperament. Look at our guzheng training, so your temperament will be more obvious. Ha ha laugh ... maybe you can get a card as soon as you listen. Of course, kids are good, too. Tell some examples that children are interested in and let her/him take them back to their parents for them to learn. Children's parents dote on their children and generally don't refuse their demands. Of course, your training course has its own characteristics, ability and reputation.