Last weekend I for the first time played tennis against a ball machine. It was quite an experience. I hit balls by myself on the court for a full three hours, working on my technique (half volley backhands, down the line side to side forehands). I’m sure I improved my game considerably. Then I played a couple of hours with lads of 17 and 13. All in all, I was on the court for six hours. At the end my right arm was killing me and my legs were shot. Excessive? Sure, but that’s the way to get good at tennis. You just keep doing it till you get it right.