Setup. Four stations in and around one goal. One: a low shot from the left. Two: a high ball to catch in the middle. Three: a 1v1 block from the right. Four: a back pass to play first time into a mini goal. A server at each, and a stopwatch.
How it runs. One keeper runs the gauntlet while the others serve. Start on the whistle. Each station must be completed before moving on: a save that is not held or cleared is retaken. Stop the clock when the pass hits the mini goal. Everyone goes twice and tries to beat their own first time.
Make it harder. Change the order each round so the keeper has to listen for which station is next. Then run it as a relay in two teams.
With 4 keepers. One runs, three serve. The server at station one runs across to serve station four.