Players aspiring to be successful high school varsity team members need to take regular private lessons to supplement group clinics – if they intend to develop effective modern stroke techniques and footwork patterns. I believe that private lessons should commence as early as 6 years. The earlier the better – so that incorrect technique and stroke swing patterns are”fixed” early. It is far harder to correct bad technique as  a teenager or adult because muscle memory is strongly established. Serious junior tennis players should participate in tournaments on a regular basis to learn to test their”game” and technique in a competitive situation where they play under pressure.