Both players rally up and down the middle of the court from a central position.
Every so often the coach shouts 'player 1' or 'player 2' and for the next 30 seconds that particular player must not step foot behind the baseline. Every ball they hit must be played with both feet in front of the baseline, however difficult this is.
Obviously if the opposing player hits a ball with perfect depth this will be difficult for the working player to respond to if their feet are inside the baseline.
Half volleying this type of ball should not be encouraged usually except if a player has been caught out of position. However for the purpose of the drill and for the players to get the feeling of taking the ball early and being inside the court, it is important they learn to cope in this situation.
"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.
As we enter the business end of the competition, we take a look at the remaining eight teams and the key talking points surrounding each side.