Hi D-Man,
One of the things we do fun is red light green light. On red light they have to stop holding a karate position. Holding a kick or strike or whatever. Their imagination is amazing. I change what they do each green light, in other words they start with running forward, then maybe run backwards, moving jumping jacks, hopping on one foot frontwards and backwards, various movements and I speed it up so maybe 3-5 seconds between green light and red light.
Another really popular activity, great for learning timing, coordination and self-confidence. Running jump kicks while I'm holding a rectangular shaped body shield. They start at the end of the dojo and run about 35 feet and jump up into a kick. Now I've got some kids that run right in to the shield, their timing is that poor. Imagine how they feel when they finally get air born and place a solid kick. I start with simple double kicks. They love it and ask for it all the time. I tell them if they focus for me in class they can jump. Works every time.
Terry