Two players stand on one side of the net attacking, while one player is on the other side and will be the blocker.
On the attacking side, a player overhand passes the ball to a team mate who sets it back to him to spike. The blocker jumps from a settled spot and blocks the attacked ball.
Have players keep hands high and legs a little bent before blocking. Hands should be put on the other side over the net during block attempt.
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.