Setup. A ladder, or six flat markers in a line, to the side of the goal. Server 10 metres out.
How it runs. The keeper goes through the ladder (two feet in each space, then sideways, then in-and-out), sprints three steps into the middle of the goal, sets, and saves a shot. Back round to the start. Each keeper goes six times, with a different ladder pattern every two.
Make it harder. The server shoots earlier. Then the keeper goes through the ladder backwards and has to turn and find the ball.
With 4 keepers. One server, three keepers rolling through.