Play on a 1/2 court (so you can have two games going at the same time).
2 players close to the net. Start the point from 1 player balancing the ball on the net and letting go. When the ball drops into the court it is allowed to bounce once.
After this they play a volley rally over the net to try and win the point.
After the first bounce the ball is not allowed to bounce again, if it does the player who allowed it to bounce twice loses the point.
Play first to 10 points.
World Rugby has reportedly conceded Aaron Smith's disallowed try in the World Cup final should have stood.
"It is not only useful for staff who are experienced but a valuable tool for those subject staff who have to take teams."
The variety of sessions across sports - sometimes we steal session ideas from one sport and use them with another.