To have your players practice vollying ( One touch shooting of the ball on goal while it is coming down out of the air) bring them to a place where they can kick against a wall (a racketball court is the ultimate) Encourage them to try to keep shooting on a specific spot of the wall and to hit the returning ball with a volley as if the keeper parried the ball and couldnt hold on to it.Watch your players score a couple of these beautys within a week.