first off i have found that kids classes should be not much longer than one hour or you will loose their concentration. secound dont get to serious with them play games that trick them into doing karate movements, and give rewards. Sometimes we would give patches to the childern who preform well or stripes on their belt. Such as respect stripe or power patch just to get the others to say to themselves i want that so i better try harder. I dont know use you imagination and good luck