|With these two handy, I can fix just about anything|
that does not involve a tennis racquet
Players on court playing out singles or doubles points. Leftover players in line at net post. Players at net post replace player making error. When point is over, first player in line at net post gives their opinion on what just transpired to end the point - error, winner, etc. Extra credit for depth of observation. For example if point ended on an error, ball hit wide, what caused the ball to be hit wide and what is the solution? Footwork? Point of contact? Positioning? Once they have rendered their opinion, they are free to rotate in and next point is played out.
Give the player making the error a chance to express what he/she thinks caused the error. It is often illuminating to hear the different viewpoints between players and observers.