Setup. Goal with two servers 10 metres out, one level with each post. A cone 2 metres off the line in each half of the goal marks the set spots.
How it runs. Keeper starts on the post, shuffles to the first cone, sets, and saves a volley from server one. Straight across to the second cone, sets, saves from server two. Four saves, then rotate: keeper to server, server to the queue.
Make it harder. Servers strike off the ground. Then after each catch the keeper rolls it out and passes to the far server with the weaker foot.
With 4 keepers. Two servers, one keeper, one resting. Rest is short, so keep the serves coming.