Setup. Keeper in goal with the balls. A target player wide on each side, 25 to 30 metres away, each with a 5 metre cone gate to run into.
How it runs. A server feeds the keeper a catch. The moment it is caught, a target player sets off into their gate. The keeper throws overarm so the ball arrives in the gate, in front of the runner, without bouncing more than once. Six throws to each side, then rotate. Count the ones a team-mate could have controlled in their stride.
Make it harder. Move the gates further away. Then add a defender who tries to intercept. Then the keeper must throw within three seconds of the catch.
With 4 keepers. Keeper, server, two targets.