In short: exercise in hindering throwing.
Organisation: One ball for every three players (of the same height as possible). There are two attackers and one hindering defender.
a ) Both attackers stand about 8 metres apart and continuously throw the ball to each other with an overhand stretch. The defender stands near one of them. She tries to tap the ball thrown by her opponent in a correct way. The attacker does not try to prevent this tapping, she plays the game. After some time, change.
b ) ls a., but now the ball is thrown with the other hand, and so the defender must try to block the ball with the other hand as well.
c ) Like a. and b., but now against another opponent.
d ) As a., but now the attacking players do their utmost to throw the ball to the co-attacking player (but only with an overhand stretching throw). If all goes well, not many balls will be hit anymore. Defending has now become real hindering.
e ) A2 moves back and forth continuously. At points 1 and 2 she gets the ball from A1, and she also plays it back immediately. V is defending her and tries to prevent her from playing the ball back. How many times can she do that in half a minute? A2 plays along, she doesn't do her best to avoid the hindering arms.
f ) Like e, but now A2 walks in V-form (she makes sideways movements all the time).
g ) Like f., but now A2 plays the ball back with swinging movements.
h ) Most difficult for the defender: A2 may choose in what way she plays the ball back to A1. Further as f.