Are there good video/online courses or books specifically targeted for aspiring kids. I see a couple of books listed on the Tennis warehouse website specially targeted for kids but dont know if they are good. Any first hand feedback? I am also interested in online/video courses that we can use. I have been following the videos available on youtube and I am my son (9 yrs old) do watch them together and discuss whats being taught. Its good to engage him and see his thought process and what he thinks of them. The only problem is that lot of you tube videos are incomplete and different coaches have different opinions leading to confusion and discussions between us. Not that I have any complains as it sometimes leads to interesting discussions between us but following one consistent course might be better. Any first hand reviews/feedback?