In cricket the way a player carries out ground fielding and throwing the ball back to his fellow players is hugley important.
Through a series of drills your players will become adept at stopping the ball and throwing it back to the stumps as quickly as possible with the goal of running a batsman out (hitting the stumps before they reach the crease).
A video shows the standard 'long barrier' technique which involves the fielder forming a barrier with the bottom half of their leg. Good technique leaves the fielder in a kneeling position.
Throwing involves getting the ball as quickly to a fellow player without it bouncing.
A good technique is to have a solid base, feet slightly apart, shoulders facing the direction you want the ball to travel. When coaching young people advise them to point to where they want the ball to go after release.