2 coaches/players are standing right outside the goal circle, each with a ball (and a couple on the floor).

In turns they now throw the ball softly against the pole of the goal and the goalkeeper must run to that side, catch the ball with the nearest hand and throw it back.
Immediately after the throw the other coach/player throws the ball against the pole and the goalkeeper must catch the ball and so on....

If the ball is dropped, a new ball is picked up at once.

This exercise is very demanding to the ankles and must not be performed before a good warming up of the ankles.
It is also a good exercise for the training of the sideway movement of the goalkeeper.

The exercise can be made between 2 cones instead of a goal.