Coach and player rally together. Coach hits different balls (left, right, high, low). Player responds with volleys/overheads to the centre.
Consistency is a first step to be successful at the net. Players have to feel comfortable while coming in and it can only happen when they feel confident. Variety of balls is a good challenge for players because they have to adjust to different balls and place it into the proper area.
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.