Begin with 2 players at the baseline on one side of the net, 2 players at the baseline on the opposite side of the net, and 1 person in the middle at about the service line. You'll have 5 players on the court. Pro feeds from the back of the court opposite the side with the net person. Baseliners try to keep a rally going and keep it away from the net player. Net player is all over the court, trying to get every ball he/she can. This gets the net player to get in the habit of moving for every ball. It's a great workout and all of my students love it. Make sure that the net player duck down each time the ball passes behind them to give his/her partners room to return.