It says that the service is the most important shot in tennis.
It's incredible how a shot so important being so despised by the players and coaches.
I imagine that a 5 years old doesn't feel very attracted to this shot as is normal.
I practiced rugby, and if the coach is not watching us, everyone wanted a ball to ourselves,
and do that which gave us more pleasure... we ran slamming each other to the ground.
Five minutes without coach was a real mess
So coach's job to make him understand the importance of service in the court,
but also in his future as a player.