Both player inside service line 1 near to to centre and other service line/sideline. Player hits volley to coach (2) and moves out to sideline, then player 2 moves in for the volley back to coach (2). Players continue holding rally.
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.