I've been put in charge of a series of tennis sessions for kids at a school fun day. 3 groups; 7-8 years, 9-10 years, 11-12 years. Half an hour each, so I should be able to fill the time in fine, but I would like to give it a bit of structure. The important point is that these are just normal kids who might take tennis as a weekly after-school activity, so ability range would vary considerably and average probably won't be that high. Any good ideas for little games that can keep such groups interested? I don't know how many kids will sign up, but I'm not anticipating overwhelming numbers, especially as we are running two courts simultaneously. All ideas much appreciated.