I have been teaching a 9 year old boy who has recently started playing tennis (not one of these nine year old playing in the 14 and under tournaments). We have had about 5 or 6 lessons together and we seem to be doing the same thing each time: warm up with groundstrokes, then do some vollies/overheads and practice serving. While i can see his improvment, he seems to be enjoying the lessons less and less. There aren't many games that one can play with a nine year old in a private lesson. Any suggestions to change things up and make it more fun. Thank you for you help!