A runs along the 23 meter line and gets the ball back from B.
A takes on the run and passes immediately to C who comes up the sideline and passes immediately to D on the back line.
If there are only 3, C runs to the back line.
D takes on the ball and dribbles into the circle.
D passes to head of circle (A)
A gives a hard pass to B for tip in.
Variations 1. start on the other touchline so that the whole width of the field is covered. 2. do the same exercise the other way 3 A shot on goal and gets another rebound ball from B