Setup. Keeper in goal. Two servers 10 metres out, side by side, a ball each. Servers work on their feet while the keeper works on their hands.
How it runs. Servers take turns to pass firmly along the ground, straight at the keeper. Get a knee down behind every one, gather it, then roll it back to the server's feet. The server takes a first touch out of their feet with one foot and plays the next ball with the other. Ten each, then swap. Score it: a clean hold is two points, a spill you recover is one, a spill the other server scores from is none.
Make it harder. Alternate which knee goes down. Then the ball is hit harder and the keeper stays on their feet, with feet together, and scoops it. Then the second server follows in every shot looking for a rebound.
With 4 keepers. Keeper, two servers, one resting.
We do this in session 1, The Basics.