I like to start with some partner drills. One fun one is a warding drill: I ask them to pair up with someone they don’t know.; one person stands with hands together out in front shoulder level, the other person stands at the side and pushes against the hands. The person with the arms out front then touches each foot in back while maintaining the mid-line hand position. They repeat from the other side then switch. When they are done (and usually laughing) I tell them they just worked their core while standing up. After that they are all mine.