I mean once you get all your basics down and footwork pretty much down would you really need it? It is mostly just hard work and since they have basics correct would it even help? Also I mean private training 1 - on 1 one hour per week. I also just met people who send their kids (mostly under 12) to private training just one hour per week; how do they expect their child to get better if they don't practice offcourt? I can understand group lessons and also paying attention to technique or mistakes though.