Player kneels down, putting one knee on the floor. Player serves from this position.
In this drill, player works on topspin and high trajectory of the serve. Low position forces players to hit all balls higher and to focus on control rather than power.
Adding wrist action can help to generate more spin so more athletic players can add this part to the serving action.
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.