Set up areas a few yards apart with cones; you have to hit an area and miss the next one, hit the next etc etc, but you have to do this consecutively; if you miss one you have to go back to the start!
A bit different to help you maneuver the ball; aim is to imagine picking the gaps in nets!
Also if you have another person unscrew the silver screw underneath a bit so that it is easily movable; then the feeder has to hold the handle, he can then move the machine instantly rather then using the black screws to change the direction which you can easily pick up!